The Hoodlum. 1959. Stars David Janssen, Russ Conway & Alan Reed. A mobster gives Diamond until 9 p.m. to turn over 'the book' or else Trumbo will have him killed.
The Mouse. 1960. Stars David Janssen, Russ Conway & Narda Onyx. Diamond is hired by a woman who is being threatened by a man she saw die 15 years earlier.
East of Danger. 1960. Stars David Janssen, Russ Conway & Judy Dan. Diamond investigates when an antique dealers discovers that his warehouse is being used to store heroin.
Fallen Star. 1960. Stars David Janssen, John Lupton & Virginia Vincent. Diamond investigates the apparent suicide of an acquaintance who was a famous singer.
The Fine Art Of Murder. 1960. Stars David Janssen, Russ Conway & Hillary Brooke. A fading actress hires Diamond to find the person who sold her a phony painting.
Seven Swords. 1960. Stars David Janssen, Russ Conway & Carol Ohmart. Diamond is hired by a magician's assistant, and arrives at a performance just in time to see her murdered.
Marked for Murder. 1959. Stars David Janssen, Russ Conway & Patricia Huston. Diamond is plunged into a case involving stolen money, a social club for the lonely and a criminal with a conscience.
The Adjustor. 1959. Stars David Janssen, Dick Foran & Nancy Valentine. Diamond investigates to find out whether an embezzler thought to be dead for the past year is actually still alive. (S1, E06)