Theirs Not to Reason Why
by Jean Johnson
4.09 · 118 ratings
futuristic · science fiction · military · war · aliens · length-long · length-medium · urban fantasy · time travel
Theirs Not to Reason Why: Similar series
The Aurora Cycle
by Amie Kaufman
4.12 · 227 ratings
magic · length-long · aliens · mystery · humor · futuristic · found-family · audiobook · young adult · suspense · dystopian · science fiction · new adult · death · military · behind-doors · war · dual-pov · queer · dark
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Starbound
by Amie Kaufman
3.93 · 231 ratings
futuristic · aliens · dystopian · science fiction · young adult · male-pov · mystery · m-f · audiobook · behind-doors · military · length-long · forbidden love · sassy heroine · from hate to love · competent heroine · suspense · dual-pov · men in uniform · war
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Skyward
by Brandon Sanderson
4.31 · 468 ratings
aliens · young adult · science fiction · dystopian · magic · military · fantasy · futuristic · war · audiobook · paranormal · mystery · humor · found-family · high fantasy · length-long · glimpses-kisses · length-short · survival · length-novella
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Starlight's Shadow
by Jessie Mihalik
4.05 · 206 ratings
science fiction · found-family · strong heroine · aliens · futuristic · military · non-human-hero · audiobook · sweet-hero · competent heroine · heroine sleuth · independent heroine · length-long · open-door · from hate to love · outlaw-heroine · height-difference · multicultural · slow burn · forced proximity
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Paradox
by Rachel Bach
4.06 · 150 ratings
aliens · mystery · dangerous heroine · futuristic · independent heroine · war · military · first-person-pov · warrior-heroine · science fiction · shapeshifters · m-f · audiobook · urban fantasy · sweet-hero · competent heroine · strong heroine · age difference · bodyguard-hero · death
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Sirantha Jax
by Ann Aguirre
3.90 · 242 ratings
science fiction · length-medium · futuristic · aliens · cold hero · strong heroine · urban fantasy · m-f · audiobook · fantasy · commander · contemporary · paranormal · open-door · military · behind-doors · fighters · tortured heroine · first-person-pov · death
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Constellation
by Claudia Gray
4.00 · 118 ratings
aliens · glimpses-kisses · length-long · science fiction · dystopian · audiobook · suspense · young adult · strong heroine · futuristic · war · military · forced proximity · mystery · dangerous heroine · independent heroine · death · historical · himbo · non-human-hero
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Insignia
by S.J. Kincaid
4.25 · 98 ratings
futuristic · length-long · war · young adult · dystopian · science fiction · military · audiobook · fantasy · male-pov · humor · mystery
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Aldebarian Alliance
by Dianne Duvall
4.17 · 161 ratings
science fiction · m-f · audiobook · futuristic · aliens · vampires · dual-pov · non-human-hero · humor · sweet heroine · military · gifted heroine · abuse · dangerous heroine · death · tortured hero · strong heroine · urban fantasy · sweet-hero · survival
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Confederation of Valor
by Tanya Huff
4.09 · 152 ratings
war · futuristic · aliens · science fiction · strong heroine · audiobook · military · survival · fantasy · humor · length-medium · paranormal · mystery · queer · time travel · length-long · pirates · suspense · m-f
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Dred Chronicles
by Ann Aguirre
4.02 · 80 ratings
dystopian · length-medium · open-door · urban fantasy · m-f · futuristic · aliens · science fiction · military · war · strong heroine · suspense · dark · graphic-violence · competent heroine · tortured heroine · survival · alpha male · audiobook · contemporary
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Imperial
by M.K. Eidem
4.17 · 104 ratings
aliens · non-human-hero · science fiction · audiobook · futuristic · age difference · length-long · military · men in uniform · strong heroine · commander · pregnancy · mystery · length-epic · cold hero · humor · possessive hero · independent heroine · fated-mates · virgin heroine
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Earth Girl
by Janet Edwards
3.99 · 74 ratings
futuristic · length-medium · young adult · dystopian · science fiction · audiobook · aliens · military
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Theirs Not to Reason Why
by Jean Johnson
4.09 · 118 ratings
futuristic · science fiction · military · war · aliens · length-long · length-medium · urban fantasy · time travel
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Liaden Universe
by Sharon Lee
4.28 · 577 ratings
science fiction · audiobook · futuristic · length-long · aliens · length-medium · paranormal · fantasy · young adult · military · competent heroine · suspense · sweet-hero · behind-doors · humor · strong heroine · third-person-pov · m-f · multicultural · secret child
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The Prime Chronicles
by Monette Michaels
3.84 · 54 ratings
futuristic · science fiction · aliens · length-medium · military · m-f · alpha male · fated-mates · breeding · anal sex · pirates · non-human-hero · cruel hero · erotica · length-novella
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Aurora Rhapsody
by G.S. Jennsen
4.33 · 77 ratings
aliens · science fiction · military · war · length-long · audiobook · length-novella · m-m · m-f · f-f · bisexual · queer · futuristic
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Rebel Wing
by Tracy Banghart
4.17 · 37 ratings
military · young adult · science fiction · dystopian · futuristic · new adult · other-man-woman · christian · love triangle · length-medium · mystery · aliens · war · high fantasy · length-short
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Xian Warriors
by Regine Abel
4.25 · 124 ratings
audiobook · m-f · science fiction · military · non-human-hero · humor · aliens · futuristic · multicultural · creative-anatomy · competent heroine · explicit-open-door · suspense · fated-mates · strong heroine · virgin hero · gifted heroine · war · length-medium · length-short
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Veredian Chronicles
by Regine Abel
4.15 · 83 ratings
science fiction · futuristic · aliens · military · explicit-open-door · length-long · humor · disabilities and marks · fated-mates · non-human-hero · length-medium · virgin hero · non-human-heroine · poly · alpha male · multicultural · length-novella · cheerful heroine · possessive hero · virgin heroine
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The Lost Fleet
by Sarah Hawke
4.28 · 49 ratings
length-medium · audiobook · military · aliens · harems · science fiction · explicit-plentiful · futuristic · breeding · poly · war · m-f-f · male-pov · anal sex · pregnancy
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The Intergalactic Union
by Natasha Campbell-Jones
3.40 · 15 ratings
human-trafficking · sunny hero · war · praise-kink · past-abuse · military · tortured heroine · first-person-pov · mental-trauma · torture-mcs · non-human-hero · vengeance · dystopian · angst · fem-dom · abduction · abuse-non-mc · friends to lovers · past-child-abuse · class difference
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Blue Planet Warriors
by Maia Starr
4.10 · 20 ratings
science fiction · futuristic · aliens · military · length-medium · length-novella · multicultural · humor
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