Andre Norton 
Star Hunter [PDF ebook] 

In the future, advanced technology has made it possible to perform "mind-swapping" procedures that implant one person’s memories, skills, beliefs, and feelings into another’s brain. Predictably, scam artists have begun to employ this technique for nefarious purposes. In Star Hunter, that’s exactly what happens to down-on-his-luck janitor Vye Lansor, who finds himself on an unfamiliar planet with a new set of memories. Will the ploy work, or will Lansor fight back? Read Star Hunter to find out.