Andre Norton 
Star Hunter 

Somewhere on the jungle world of Jumala, there is a man in hiding — a man whose mind has been reconditioned with another’s brain pattern and for whom there is a fabulous reward. Star Hunter is the thrilling account of an other-worldly game of hide-and-seek between a man who does not know all his own powers — and an interstellar safari that seeks something no man has a right to find…