The Demon Princes by Jack Vance

Demon Princes is a series of five science fiction novels by Jack Vance, which cumulatively relate the story of one Kirth Gersen as he exacts his revenge on five notorious criminals, collectively known as the Demon Princes, who carried the people of his village off into slavery during his childhood. Each novel deals with his pursuit of one of the five Princes.

* * *

In a far-off future, criminals have the freedom to pursue their most violent passions among the civilized worlds of the Oikumene, assured that justice cannot follow when they escape into the lawless Beyond—a vast playground where the most elusive and monomaniacal murderers, thieves, and slavers can conquer a world of their own, play out complex fantasies of bloodlust, pursue revenge and immortality over generations, give themselves to a psychotic world of self-absorption, and devalue their neighbors' property values.

Five of the most quixotic and efficient killers in the Gaean Reach gathered to execute a joint venture, slave-taking on the colony world of Mount Pleasant. One survivor of that raid dedicates his life to mold his grandson, Kirth Gerson, into a seeker of justice and executioner of these five. Gathered in this unified offering is the tale of Gersen's revenge.

This book is part of the "Demon Princes" series.
Here are some other books from this series: