Books in the Chronicles of the Empire series

Horrific torture in an alien prison torpedoed Captain Ari Idylle's military career. Stripped of command and banished to her father's scientific expedition to finish a PhD she doesn't want, Ari refuses to fly a desk. She intends to have her command back by any means possible, until pirates commandeer her father's ship, and she's once again a prisoner. Perhaps this cunning captor isn't what he pretends to be. As far as Cullin Seaghdh is concerned, the same goes for Ari. Her past association with aliens puts her dead center in Cullin's cross-hairs. If she hasn't been brainwashed and returned as a spy, then she must be part of a traitorous alliance endangering billions of lives. He can't afford the desire she fires within him. His mission comes first. He'll stop at nothing, including her destruction, to uncover her true purpose and protect what is his.