Secret of the Lost Race — Andre Norton

Joktar was running for his life -- and he didn't know why. After growing up orphaned in the spaceman's helltown of interstellar New York, Joktar was adept at dodging the law, but he knew of no special reason why all the police forces of the civilized galaxy should suddenly concentrate on him. All he knew was that he had to run -- out of the Solar system and across the galaxy to the mysterious Wolf worlds. In the freezing hell that was the planet Fenris, Joktar turned to face his hunters and fight to regain his freedom in a universe gone mad.