Books like 'Citadel'
Readers who enjoyed Citadel by Claire Kent also liked the following books featuring the same tropes, story themes, relationship dynamics and character types.
futuristic science fiction age difference dystopian cold hero forced proximity virgin heroine angst praise-kink competent heroine
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Tane by Anna Hackett
Rated: 4.71 of 5 stars · 17 ratingsAs the battle against the invading aliens reaches its endgame, a group of bad boy bikers and mercenaries will stand and fight for humanity’s survival…. Tane Rahia is good at one thing—fighting. Before the alien invasion, he fought as a mercenary in the worst jungle hellholes...Categorized as:
dystopian military independent heroine new adult abduction m-f aliens science fiction -
![End Game by Lindsay Buroker]()
End Game by Lindsay Buroker
Alisa Marchenko has reunited with her daughter, and even though she hasn’t figured out how to get Jelena to accept Leonidas yet, she dreams of the three of them starting a new life together. They can return the Star Nomad to its original purpose of running freight and staying out of trouble (mostly)...Categorized as:
military competent heroine cold hero m-f humor science fiction futuristic mature couple -
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![When She Belongs by Ruby Dixon]()
When She Belongs by Ruby Dixon
He’s the biggest jerk in the galaxy. I can live with being stuck on the far end of space. I can live with having to spend weeks on an abandoned station in an asteroid belt. Sure, I don’t belong, but I’ve got my book and my eight-legged attack cat with me. I should be fine. I’m not fine. My alien host, Jerrok, is a jerk. He’s surly and unpleasant. He hasn’t bathed in years... -
![A Home for the Alien Warrior by Honey Phillips, Bex McLynn]()
A Home for the Alien Warrior by Honey Phillips, Bex McLynn
Can a lonely alien warrior find the family he’s always wanted? When tragedy shatters Claire’s world, she abandons her corporate job and retreats to a remote mountain town. Just when she finally begins to rebuild her life, she is abducted by alien slavers. Unable to escape the scientist who purchases her, she devotes herself to the young alien twins who are also trapped by his twisted experiments...Categorized as:
abduction forced proximity insta-love competent heroine possessive hero m-f science fiction aliens -
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![Perilous Hunt by Lindsay Buroker]()
Perilous Hunt by Lindsay Buroker
After failing to catch up with her daughter Jelena so many times, Alisa's optimism is battered, but her determination has never waned. She, Leonidas, and their eclectic crew are hunting down a Starseer research station in the heart of the Kir Asteroid belt—Jelena's supposed location. Alisa vows that she will find her daughter if she has to search a million asteroids to do so...Categorized as:
military competent heroine cold hero bodyguard-hero m-f humor science fiction futuristic -
![Imperator by Anna Hackett]()
Imperator by Anna Hackett
Rated: 4.44 of 5 stars · 20 ratingsSpace station security specialist Sam has done one thing since her abduction by alien slavers…fight to survive. But now one strong alien gladiator stands at her side and Sam knows she is no longer alone. Thrust into a lawless desert arena, Sam Santos has done terrible things in order to stay alive. As the Champion of Zaabha, she’s been fighting to find a way out...Categorized as:
military m-f competent heroine independent heroine abduction bodyguard-hero aliens science fiction -
![Craved by the Hunter by Lynnea Lee]()
Craved by the Hunter by Lynnea Lee
SAM. When a legendary PIP model shows up in my shop, I jump on the chance to work on the sentient shuttle, until I meet Pip’s owner. The surly hunter hates humans and has earned himself the nickname Loose Cannon... -
![Trial and Temptation by Ruby Lionsdrake]()
Trial and Temptation by Ruby Lionsdrake
After ten years of flying freighter ships from planet to planet, Val Calendula never thought she would apply for a job as a combat pilot in a mercenary outfit. But her brother has gotten himself into financial trouble, and he’s heading to a mining prison if Val can’t pay off his debts. Mercenaries don’t always live long. .. but they make good money while they’re alive... -
![Victoria's Challenge by M.K. Eidem]()
Victoria's Challenge by M.K. Eidem
Victoria Lynn Chamberlain… at two, she was abducted by an alien race, the Regulians… at nine, her world literally explodes when the Regulians returned, destroying Earth. She and her Aunt are the only survivors thanks to another alien race, the Carinians. Now she’s eighteen, a new graduate from their top medical school, and is ready to claim her life mate...Categorized as:
military abduction age difference insta-love virgin heroine competent heroine m-f science fiction -
![Alien Mask by Ursa Dax]()
Alien Mask by Ursa Dax
“I never wanted a mate. Until this troublesome human showed up and changed everything. ”PRIYA. Lerokan is a huge pain in my human butt. He’s cocky, obnoxious, and refuses to show me his face, hiding it behind a bone mask. He keeps saying he saved me from the battle. But all I see is the man who separated me from my friends... -
![Heartless by Grace Goodwin]()
Heartless by Grace Goodwin
My destiny is not to claim a female, to have a family, to be rendered helpless by love. Despite this, I am matched. A beautiful human female is now mine. Despite my warnings, she is determined to leave her mark on me, body and soul. Honor demands I resist. I tell her the truth. I will not place a mating collar around her neck...Categorized as:
forced proximity m-f praise-kink caretaking betrayal military cold hero possessive hero -
![Arkadian Skies by Lindsay Buroker]()
Arkadian Skies by Lindsay Buroker
With the man who kidnapped her daughter imprisoned aboard her ship, Captain Alisa Marchenko is closer than ever to reuniting her family. But her new guest has been in a coma for weeks, with the secret to her daughter's location locked away in his mind. She must find a way to sneak him into a state-of-the-art hospital on Arkadius, a planet in the heart of Alliance territory...Categorized as:
military competent heroine m-f cold hero bodyguard-hero humor science fiction futuristic -
![Cleon Moon by Lindsay Buroker]()
Cleon Moon by Lindsay Buroker
Now that she’s retrieved the Staff of Lore, Captain Alisa Marchenko can finally dedicate herself and her ship to finding her kidnapped daughter. Her scant clues lead her to Cleon Moon. Unfortunately, since the fall of the empire, mafia clans have taken over the domed cities on the harsh moon, and exploring there isn’t easy...Categorized as:
military competent heroine cold hero bodyguard-hero m-f science fiction futuristic slow burn -
![Relic of Sorrows by Lindsay Buroker]()
Relic of Sorrows by Lindsay Buroker
Captain Alisa Marchenko finally has a lead on finding her daughter, but her passengers want her to take them on their quest instead. Even though the Star Nomad is her ship, they have power she cannot fight, and she finds herself with no choice but to accept another detour. But the ancient relic they seek has the ability to destroy worlds and is coveted by many...Categorized as:
military m-f competent heroine cold hero bodyguard-hero science fiction futuristic aliens -
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![Peripeteia by Sarah Lyons Fleming]()
Peripeteia by Sarah Lyons Fleming
Book two of The City Series is here! Months into the apocalypse, the zombies show no signs of dying, but it’s clear everyone in Sunset Park will die without enough food to outlast the undead. Add in the less-than-sociable new neighbors only blocks away, and the hunt for sustenance has come to feel more like a race than a ramble...Categorized as:
dystopian new adult angst suspense m-f caretaking friends to lovers forced proximity -
![Olivia and the Orc by Honey Phillips]()
Olivia and the Orc by Honey Phillips
An orc guard. A kidnapped human. A treacherous journey…. The last thing Olivia remembers is celebrating a friend’s birthday. The next thing she knows, she and her friends are being marched across an alien desert by a gang of small lizardmen - and one very large and forbidding green alien... -
![Saved by the Alien Hybrid by Lynell Miles]()
Saved by the Alien Hybrid by Lynell Miles
Commander Cordelia Normandy is desperate for redemption. After her catastrophic final flight mission, she sees her new assignment delivering colonists as a fresh start. At least, until she wakes from cryosleep to find herself caught in an interstellar war between an alien empire and their hybrid creations. As a hybrid rebel fighting against the empire that made him, Rentir has only known conflict... -
![Hunted by the Alien Berserker by Mina Carter]()
Hunted by the Alien Berserker by Mina Carter
She’s a pilot, not a people person. What does she know about keeping a bunch of women alive on an alien planet? Even worse, said planet has alien cavemen intent on carrying them off to their lairs to… do whatever it is alien cavemen DO to their captives. Yeah, that doesn’t take a genius to figure out...Categorized as:
military forced proximity m-f age difference abduction competent heroine possessive hero aliens -
![Unrest by Wendy Higgins]()
Unrest by Wendy Higgins
Rated: 4.37 of 5 stars · 15 ratingsNew York Times bestselling author Wendy Higgins brings you the second book in this thrilling apocalyptic world. .. Being on the run in the desert means food and sanctuary are hard to come by, but Amber Tate and her crew are not about to give up. Not after having the things they love brutally ripped from them by an unknown enemy who sent their world into the apocalypse... -
![Fighting Captivity by R.K. Munin]()
Fighting Captivity by R.K. Munin
Born deaf, Zia Higgs never let that stop her from going after what she wants. After growing up poverty-stricken on the human colony of Wimol, she found a high-paying job with a scrap trawler that allows her to send money home and also save for new implants... -
![Holmes by Anna Hackett]()
Holmes by Anna Hackett
Rated: 4.36 of 5 stars · 14 ratingsThe battle of survival against the invading aliens heats up…but Hell Squad never quits. General Adam Holmes’ life is dedicated to keeping his small band of survivors alive. On the run, with only Hell Squad and the other soldiers for protection, they are making their last dangerous drive to the secret stronghold of the Enclave... -
![Hunted by Lisa Harris]()
Hunted by Lisa Harris
Rated: 4.43 of 5 stars · 11 ratingsHe promised to protect her. But what happens when the hunter becomes the prey? Welcome to Shadow Ridge, where LONGMIRE meets JERICHO. From USA Today Best-selling author Lisa Harris comes an epic series where the survival of Shadow Ridge depends on learning how to fight crime all over again...Categorized as:
dystopian suspense new adult christian contemporary science fiction futuristic length-short -
![Shadow's Chosen by Olivia Riley]()
Shadow's Chosen by Olivia Riley
From their first encounter, she knew he was trouble. A top operative in her field, Elise was trained since youth to be one of Earth's most elite soldiers. But nothing could prepare her for Tyrminus and the deadly aliens taking over the city. One job: find the Grayhart team of explorers that have disappeared within the undercity and bring them back alive. A seemingly impossible mission... -
![Protected by the Alien Mercenary by Robin O'Connor]()
Protected by the Alien Mercenary by Robin O'Connor
Trapped in a terrible situation, I decide to hire a mercenary to help me escape. Pay him? I’m sure we’ll figure that out…. Rikki. I’ve been kidnapped and auctioned off. I’m not waiting around for my new ‘owner’ to do whatever he wants with me. When he leaves me with his guard in a sleazy bar, I see my chance...Categorized as:
m-f bodyguard-hero abduction possessive hero height-difference caretaking insta-love aliens -
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![Alien Castaway by Honey Phillips]()
Alien Castaway by Honey Phillips
Can a runaway bride and an escaped alien prisoner find sanctuary together? Darla’s life changed forever the day the aliens invaded Earth. Her worthless father and shiftless brother have used the presence of the Yehrin as an excuse to keep her under their control. Their latest scheme? Marry her off to one of their equally disgusting cronies as part of a business arrangement...Categorized as:
virgin heroine m-f height-difference caretaking forced proximity insta-love survival plain heroine -
![The McClane Apocalypse Book Ten by Kate Morris]()
The McClane Apocalypse Book Ten by Kate Morris
Rated: 4.67 of 5 stars · 6 ratingsAs the McClane saga continues, the family realizes that someone in their trusted, inner circle may just be the person who has leaked precious information about them, Fort Knox, and their community allies to the men who were running the highwaymen and ultimately to whoever they were reporting... -
![Alien Incognito by Cara Bristol]()
Alien Incognito by Cara Bristol
Rated: 4.67 of 5 stars · 6 ratingsBeing saved from a slave ship and given life-saving medical attention by a tall, muscular furry alien with large curling horns is enough for Giselle Cartier to think she’s found a hero. Having him deliver her back into the clutches of the same traffickers shatters her trust and the belief that anything she’d felt was real...Categorized as:
forced proximity suspense abduction m-f second chances from hate to love aliens science fiction -
![The Explorer by Elin Peer]()
The Explorer by Elin Peer
Flirting with danger is Aubri’s idea of fun. Ever since we were children, I’ve known Aubri wasn’t like other females. She’s the daughter of Magni and Laura Aurelius, who raised her to be a fearless warrior. Men are blinded by Aubri’s beauty, charm, and social status. Yet, at twenty-seven, no one has succeeded in making her his wife... -
![Of A Darker Void by G.S. Jennsen]()
Of A Darker Void by G.S. Jennsen
Rated: 4.50 of 5 stars · 8 ratingsWhen man and machine are one and the same, death is no longer an inevitability. But in the darkest reaches of space, neither is life. Diplomat. Rebel. Fugitive. Nika Tescarav has lived many lives, though she no longer remembers most of them... -
![Chaos: Love After the Apocalypse by Imogen Keeper]()
Chaos: Love After the Apocalypse by Imogen Keeper
Before the apocalypse, we were strangers. Now our lives will forever be entwined. The gripping, intensely romantic sixth installment of award-winning author Imogen Keeper's wild ride After the Plague Series. There’s no law anymore and no justice. As power consolidates in post-apocalypse D. C. and Ben holds me captive in the mountains, chaos is the only rule. It’s calling to Yorke... -
![Legion by Regine Abel, Juno Wells]()
Legion by Regine Abel, Juno Wells
He gave her his soul, but she couldn’t hold it. Ayana has devoted her life training to join the Vanguard, an elite intergalactic military force dedicated to fighting back the Kryptids who nearly destroyed Earth. Only the most powerful psychics are chosen...Categorized as:
military insta-love age difference suspense m-f betrayal competent heroine bodyguard-hero -
![Broken by the Horde King by Zoey Draven]()
Broken by the Horde King by Zoey Draven
Nine years ago, he broke my heart and never returned. I vowed to forget him…if only I could. When I was a child, I fell in love with a Dakkari boy. The prince of our clan. Rukkar, we called him. For he was destined to become the greatest horde king of our time. He was Kiran of Rath Okkili. My friend. My strong, unyielding protector...Categorized as:
friends to lovers second chances virgin heroine angst possessive hero competent heroine grovel m-f -
![Alien Scars by Ursa Dax]()
Alien Scars by Ursa Dax
This is Gahn Thaleo and Nasrin's story. Book 16 of the fated mates alien romance series Fated Mates of the Sea Sand Warlords. -
![Bound to the Beast by Grace Goodwin]()
Bound to the Beast by Grace Goodwin
He’s a warlord on the edge. She’s a teacher on the run. Their worlds are about to collide—in the most explosive way possible. Warlord Iven has one foot in the grave, days away from a ceremonial execution to save his honor—and the galaxy—from his untamed beast. But when a desperate plea lands a mission in his lap, everything changes. A royal child is in hiding. Assassins are on Earth...Categorized as:
m-f height-difference insta-love military science fiction length-novella aliens futuristic -
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![North by Anna Hackett]()
North by Anna Hackett
We survived the invasion and beat the aliens. But they left something behind…. I was born to protect. I’m a Connors, a soldier like my father before me, and I’m the medic for Hunter Squad. Every time we go out to hunt the mutated monsters the aliens left behind, I’m there to treat anyone who gets hurt. But sometimes, I can’t always save everyone, and that haunts me...Categorized as:
military new adult suspense m-f insta-love forced proximity hurt-comfort competent heroine -
![Safe by Imogen Keeper]()
Safe by Imogen Keeper
The addictive fourth installment of author Imogen Keeper's wild ride After the Plague Series. Frankie and Yorke are trapped in a post-apocalyptic pot, the flame's on high, and they're a breath away from boiling over. For months, we fought to get out of the city, away from the gun collectors and kidnappers at the White House... -
![Hitched to the Alien General by Mina Carter]()
Hitched to the Alien General by Mina Carter
Her perfect man is a big, scarred alien war hero. Pity he only see’s her as a warrior, not a woman. .. Kenna Reynolds loves life in the Imperial Court. The latharian culture fascinates her, and she values the friendships she’s made amongst the sentinel women, most bonded to Latharian males, and a few with babies on the way...Categorized as:
military suspense age difference height-difference m-f science fiction futuristic aliens -
![Changed by Heather Fox]()
Changed by Heather Fox
Waking up from cryostasis alone in an unfamiliar place is bad enough, but the holes in my memory make things so much worse. I had a mission - protect the research team. Only, I can't remember who the research team were, what they were researching, or what lead to me being frozen in the first place. All I know is there are monsters here - green skinned, with fangs and claws...Categorized as:
dystopian angst military competent heroine independent heroine hurt-comfort m-f caretaking -
![Niko by Anna Hackett]()
Niko by Anna Hackett
Rated: 4.23 of 5 stars · 13 ratingsIn the aftermath of a deadly alien invasion, a band of survivors fights on…. Mackenna Carides is tough, strong, and excellent at her job as second-in-command of Squad Nine. She often works side by side with Hell Squad on some of the toughest missions to fight back against the alien raptors. Now she’s helping the survivors of Blue Mountain Base settle into their new home at the Enclave... -
![Hemi by Anna Hackett]()
Hemi by Anna Hackett
Rated: 4.30 of 5 stars · 10 ratingsIn the middle of an alien invasion, a big, tough, tattooed former mercenary is finally going to chase down his woman. Camryn McNab knows love is a lie. Okay, maybe not for everybody--her fellow soldiers on Squad Nine have managed to fall in love in the middle of a vicious alien attack. But it's not for her. She comes from two people incapable of love...Categorized as:
military independent heroine m-f aliens science fiction futuristic length-short audiobook -
![Levi by Anna Hackett]()
Levi by Anna Hackett
Rated: 4.30 of 5 stars · 10 ratingsIn the middle of an alien invasion, a bad boy berserker collides with a spunky mechanic on a dangerous sabotage mission. Levi King has always lived rough. Raised by a biker dad, he fought for everything he had—including being president of the Iron Kings motorcycle club. But when the aliens invaded, he lost it all...Categorized as:
dystopian military independent heroine m-f aliens science fiction futuristic length-short -
![Buried Flames by Kennedy Layne]()
Buried Flames by Kennedy Layne
Rated: 4.43 of 5 stars · 7 ratingsMason Sykes had served many years in the Marine Corps for his country. His loyalty and sacrifice had left him disfigured—inside and out. He didn’t harbor regrets, especially since he’d finally found the peace and quiet he’d always desired on a Nebraska farm. Brenna Helm was a country girl through and through, right down to her cowgirl boots... -
![Wrath by Regine Abel]()
Wrath by Regine Abel
She conquered death. Can she conquer life? Kwan’s dreams of joining the Vanguard finally comes true. Unfortunately, a recent tragedy dampens the joy of this experience. She hopes that reuniting with her long-time friend Linette and embarking on epic rescue missions will help bury painful memories...Categorized as:
military angst suspense m-f forced proximity hurt-comfort second chances independent heroine -
![Seeking Vector by Cynthia Sax]()
Seeking Vector by Cynthia Sax
Rated: 4.60 of 5 stars · 5 ratingsA cyborg with a secret… A female seeking the truth…. Vector, the C Model captain of the Freedom, is a cyborg many warriors wish to emulate. He fights fiercely, leads with honor, has earned the respect and loyalty of his crew. But no being, not even a cyborg, is perfect. Since arriving at the Homeland, Vector has been hiding a dark truth about his past...Categorized as:
military m-f competent heroine futuristic science fiction tall-heroine length-short black-mc -
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![Taken by the Spare by Vilyn DeVine]()
Taken by the Spare by Vilyn DeVine
Rated: 4.60 of 5 stars · 5 ratingsI had one day left on my shift when chaos erupts. Taking a job as a correctional officer on a ship that orbits Earth and Hydor isn’t thrilling, but it pays well. And once my month-long shift is over? I get a month of paid vacation. I work, then I travel. Repeat. I had just one more day to go, and then I’d be shuttled back to Earth and ready to go on my next adventure... -
![The Strongest Gravity by Rachel Nova]()
The Strongest Gravity by Rachel Nova
When healer Eleri flees her home on Gaia to escape her brother's dangerous drug addiction, she expects alien patients, living on a frontier planet, and a mating contract with a latil'e male she's never met. What she doesn't expect? S'samph taking one look at her and declaring their arrangement "a mistake. ". But Eleri didn't cross hyperspace to beg for anyone's approval... -
![Finn by Anna Hackett]()
Finn by Anna Hackett
Rated: 4.22 of 5 stars · 12 ratingsIn the aftermath of a deadly alien invasion, a band of survivors fights on…. For Hawk pilot Finn Erickson, flying is in the blood. Since the aliens decimated the planet, he spends most of his time flying Hell Squad into combat. With communication to other survivor bases cut off, he has no idea if his family is still alive and feels their loss keenly...Categorized as:
military dystopian independent heroine m-f futuristic aliens science fiction length-novella -
![The Tracker's Dilemma by Ruby Lionsdrake]()
The Tracker's Dilemma by Ruby Lionsdrake
Sergeant Heath “Tick” Hawthorn, the best tracker in Mandrake Company and the captain’s right-hand man, has been admiring microbiologist Lauren Keys from afar for months. Unfortunately, she’s dedicated to her science and doesn’t seem to have any interest in relationships. He’s not even sure she knows his name...Categorized as:
military new adult suspense competent heroine independent heroine m-f survival forced proximity -
![7SEEDS 3 by Yumi Tamura, 田村由美]()
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![Alpha Collects by Milana Jacks]()
Alpha Collects by Milana Jacks
It takes a special kind of Omega to bring an Alpha to his knees. Kind. Sweet. Beautiful. With legs that go on forever, colored eyes, perky protruding nose, funny ears, and… Were was I? Ah yes, I collected one such Omega, and I’m bringing her before my king. I am Tayseer, the Collector, the Legend. And I will deliver my people the queen.
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