Sam McCade Series by William C. Dietz

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 McCade -- an interstellar bounty hunter with a score to settle.Betrayed by his friends, stalked by his enemies, McCade is the only one standing between a terrifying alien threat -- and the unimaginable devastation of the Terran Empire...

Since her brother's absence, Princess Claudia has seized the throne and brought the Empire to the brink of war with the Il Ronn. Only the missing Prince Alexander can stop Claudia's plans. And McCade, the best bounty hunter in the galaxy, has only three months to find him. But Princess Claudia controls the Imperial Fleet and will stop at nothing to keep McCade from bringing in his imperial bounty...

From national bestselling author William C. Dietz, McCade for Hire collects the first two action-packed novels featuring Sam McCade-an ex-Imperial Navy soldier turned interstellar bounty hunter.

For years, only the thinnest barrier kept the II Ronnian Empire from attacking mankind. Then, space pirates stole the Vial of Tears--a holy Ronnian relic with cosmic religious powers. Only one man can hunt down the sacred relic and avert interstellar war--bounty hunter supreme Sam McCade.

From acclaimed author William C. Dietz, a novel of Sam McCade, interstellar bounty hunter. This time it's personal--pirate Mustapha Pong has kidnapped McCade's daughter. Usually, McCade works for pay, but this time, the only reward is seeing his daughter alive--and he'll do anything to make that happen.