That Which Survives — Ciana Stone

Senna Lascran, a professor of physics, may find her life quiet and uneventful and her love life lukewarm at best, but that's okay. There's enough pain and mystery in her past to last a lifetime. Until she meets Konnor Chase. Dark and brooding Konnor awakens yearings Senna wasn't aware she was capable of. In fact, she isn't certain she wants to be around him at all.

But when a string of murdered scientists lead the police and the corrupt leader of a convert agency to Senna, embroiling her in a series of events that take her ever closer to discovering the deadly secrets of her past, Konnor, an ex-operative of the same covert agency shadowing Senna, may be the only person who can save her.

Konnor wants nothing more than to forget his past and the mystery of the six missing weeks of his life. Content to run his small martial arts school, he works on finding inner peace, which eludes him after more than a decade of trying. When fate thrusts Senna into his life, his primary goal is to keep her alive, and learn to deal with the strong emotions she's awakened inside him.