Star King — Jack Vance

Star Kings were a race of aliens who disguised themselves as human.They sought only power -- power over the real men and women they looked upon with both contempt and lust.

Keith Gersen had been a peace-abiding man until the terrible moment when five of these Star Kings descended upon the planet and home of his parents and viciously wiped them out as an "object lesson: At that news, vengeance became Gersen's sole objective in existence -- to seek out and destroy those five Demon Princes.

First on his list was Attel Malagate. His name was probably a fake, his appearance was unknown, but his style was vicious and his appetite was for human slavery.

With only this to go on, Gersen was ready to track him down across a thousand stars...