At Empire's Edge (Unabridged‪)‬

In a far-distant future, the Uman Empire has spread to the stars and beyond, conquering and colonizing worlds, ruling with a benevolent - but iron - fist. The Pax Umana reigns, and all is well. But on one planet, the remnants of a violent, shape-shifting race called the Sagathis are confined, kept captive by xeno-cops, who have been bio-engineered to be able to see through their guises. Still, sometimes one manages to escape. Zak Cato is a xeno-cop. He's returning a fugitive Sagathi when things go horribly wrong. Cato - the only survivor after the rest of his men are slaughtered - must now figure out who betrayed them and bring the alien in, whatever the cost.
BONUS AUDIO: Includes an exclusive introduction written and read by author William C. Dietz.