My Name Is Legion — Roger Zelazny

HE DID NOT EXIST...OR DID HE?

He had destroyed his punch cards and changed his face. There was no credit card, birth record, or passport for him in the International Data Bank. His names were many... any he chose.

His occupation was taking megarisks in the service of a vast global detective agency. His interworld assignments were highly lucrative, incalculably vital, and terrifyingly deadly.

And more often than not, his life was a living hell!