Frank Cannon lives in a penthouse on the Sunset Strip, where his passion is gourmet cuisine prepared by himself. In between meals he hires out as a private investigator to select clients in need of top-drawer work from a professional trained in the ways of the world.

George McCowan's work on this series sets a new standard by treating television as simply a more mobile cinema. He registers the descendance of television from film, not merely radio.

After creating Marshal Dillon in Gunsmoke on radio, and a great deal of film work, Cannon is the great achievement of William Conrad's career as an actor: genial, witty and acute.