Novelization of, I believe, two episodes from the television show. One is certain - Return to Sender.
The blurb on the back of the book reads:
"Gene Brady was everyone's pin-up and nobody's fool.
"Temperamental film star, rugged athlete, hell-raiser, what better cover could a good-looking secret agent want?
"In Nice two girls brought double trouble, one was warm and willing, the other cold and contorted - a corpse on his bathroom floor ..."
Note: Notice the last name of the character is 'Brady', not 'Bradley'.