Ki Book One — Odette C. Bell

A fantasy/sci-fi crossover, the books of Ki are an action-packed exploration of a world torn apart by war and mystery.
.....
In a snapped second his life changes. A woman falls from the sky, right before his eyes. She is his enemy. Yet the men that hunt her are worse. As his life crashes down around him, Jackson is faced with a horrible choice: blind loyalty to the country he loves of informed betrayal for a woman he hardly knows. He chooses her.