Cally's War — John Ringo; Julie Cochrane

LOOK INTO THE ABYSS--

For as long as Cally O'Neal could remember, she had lived in danger. She had been raised practically on the front-lines of the war with the Posleen that had erased five billion humans from the face of the earth.

The abyss looks back--

In the final stages of the war she had officially "died" and been recruited into the elite ranks of the Bane Sidhe, a group of underground warriors dedicated to breaking the stranglehold of the elf-like Darhel on the Galactic Confederation--and secretly on the human race.

And you become the abyss--

Now, on the most important mission of her career, at odds with her superiors, hunting a mole who could destroy her at any moment, and inexorably falling in love with the enemy, for the first time in her life she has to wonder if it's worth it. If being a dragon is the best way to fight the dragon. Cally had been fighting for the future of the human race, but now she is in a war for survival: the survival of her soul.