Underground Series by Esther Mitchell

The clock is ticking, and the Commandos must hunt down a deadly mole in the Intelligence Network, before time runs out and the world plunges headlong back into war. As time slips away, they'll learn what's most important to defend, and draw the lines of a new kind of battle - against a system that's been corrupted from the inside.She had something to prove...She just never knew it was her loyalty.Marine Captain Tamia Kuan is no stranger to war... moreThe clock is ticking, and the Commandos must hunt down a deadly mole in the Intelligence Network, before time runs out and the world plunges headlong back into war. As time slips away, they'll learn what's most important to defend, and draw the lines of a new kind of battle - against a system that's been corrupted from the inside.She had something to prove...She just never knew it was her loyalty.Marine Captain Tamia Kuan is no stranger to war. Raised in war-torn Tibet, and then turned loose with the street gangs of Old San Francisco, Tamia is living proof that no matter the crisis, the strong will survive. On the streets, she learned to bury her heart to survive, and, but the end of the world war known as the Divide, that survival depended on no longer having a heart at all. But one man's doubt in her innocence will turn the tables on her, and force her to free her heart. For, in the midst of one of the deadliest counterespionage missions of her life, the one thing that saves her life could be love.They called him a machine,Until he found a reason to live...Ex-SEAL Commander Richard Carinson was a legend in his own time, the man called "the bullet-proof machine" for his methodical but charmed battlefield life. As founder and leader of the elite Commandos, he sought to shed his former image, vowing to never leave a man, or a woman, behind. But Rick's greatest challenge will be one of faith, when a woman with haunted eyes, sleek beauty, and a dark secret lays claim to his heart. And, when their most lethal mission yet drops a dangerous task into her lap, Rick will have to choose between the world he's fighting to redeem, and the woman he just might be able to save. less

New York City, 2118 Nobody ever had to tell Tamia Kuan that the past came with a price tag. She's always known that she'd pay for her mistakes someday. What she never expected was that she'd have to pay for them with another's life. But when a reconnaissance mission leaves her reeling, she'll discover that she's broken a Code that could mean her death, if her secret is ever leaked. Now, to keep her secret safe, she'll have to conceal the truth from everyone; especially the man she loves... moreNew York City, 2118 Nobody ever had to tell Tamia Kuan that the past came with a price tag. She's always known that she'd pay for her mistakes someday. What she never expected was that she'd have to pay for them with another's life. But when a reconnaissance mission leaves her reeling, she'll discover that she's broken a Code that could mean her death, if her secret is ever leaked. Now, to keep her secret safe, she'll have to conceal the truth from everyone; especially the man she loves.Richard Carinson is a lot of things, but stupid isn't one of them. When a dangerous Mole's activity flags an unheard-of base in South America, he'll have to send his best spy to uncover the truth, even if that means placing the woman he loves in harm's way. But the woman who returns from the jungles isn't the same one he sent, and he knows she's hiding something, even if he doesn't know what. He'll have to find a way to uncover the truth, before her secret rips them all apart. less

Commando Tamia Kuan hasn't had an easy life, but she's never made excuses for making the best of what she has. Her life is beginning to come together... Until the loss of a friend drives home the one lesson in life she's been hiding from -- no one is invincible. Now, she's faced with the very real possibility of losing everything she holds dear. Can a dangerous past be unmade, before it brings any hope of a future crashing down around her?