The infinite cage

Synopsis from back cover: A little wisp of a man appears from who-knows-where, apparently suffering from delusions, schizophrenia, paranoia, and mental maladies not yet named. His misadventures in a hostile world would put Walter Mitty to shame for lack of imagination. He finds he has strange powers that bring him spectacular success at whatever he attempts--followed, it seems inevitably, by crushing disaster. At last, on the verge of utter despair, he stumbles onto a clue to the secret of his existence... Keith Laumer, famous for his witty novels of galaxy-hopping adventure, has created a spooky, funny, hauntingly brilliant novel that cannot be put down--and will never be forgotten-- Welcome To Adam's World