The ABC episodes ended with "Cross That Palm When We Come To It" (broadcast on 13 April 1968) as Marker acts for a solicitor over some stolen jewels, as a go-between with the gang who stole them and want the reward money. Taking the recovered jewels back to his office, Marker receives a visit from the police and is convicted of receiving stolen property—the solicitor who hired him was crooked and has disappeared. Marker pleads guilty to the charge and is sentenced to two-and-a-half years in prison. "Cross That Palm" is not one of the five surviving ABC episodes. It did however provide the basis for a 1974 novelisation by Audley Southcott (Sphere Books, ).