The Killing Machine (The Demon Princes Series‪)‬

Five intergalactic criminal masterminds raid the tranquil world of Mount Pleasant, leaving behind only ruin and slaughter—and the orphaned child Kirth Gersen, who comes to manhood swearing to take bloody revenge. Now Gersen roams the galaxy, bringing vengeance to the Demon Princes one by one, in Jack Vance’s classic series of hardboiled space opera.

Someone is stealing the children of the galaxy’s elite, and Kirth Gersen suspects that the kidnapper is Kokor Hekkus—second of the Demon Princes. Deciphering a complex pattern of clues and coincidences, Gersen tracks his quarry to a barbaric world, where Hekkus is protected by an invincible war machine. To confront Hekkus, Gersen must resort to a desperate plan.