William C. Dietz 
Galactic Bounty 

First in the action-packed series from the New York Times–bestselling author “known for the complex political and social layout of his future worlds” (Publishers Weekly).   A traitor is on the loose. A treacherous navy captain plans to sell military secrets to the alien Il Ronn. The only man who can stop him is Sam Mc Cade. Betrayed by his friends, stalked by his enemies, Mc Cade is the only one standing between a terrifying alien threat–and the unimaginable devastation of the Terran Empire?