Gunn is hired by a jazz club owner to prove one of his musicians has been framed for murder, but the musician's lawyer doesn't want Gunn's assistance.

A surprise murder witness refuses to talk to anyone except Peter Gunn.

A low-level mobster, the Frog (Stubby Kruger), is stabbed on a dock and falls into a river, his jaunty green hat floating above him. The Frog was waiting to meet Peter Gunn, who is jumped when he goes to the Frog's apartment. Gunn kills his attacker, setting off a police investigation into the deaths.

A young man enters his apartment and is immediately put into a sleeper hold by a huge assailant waiting inside, in the dark. The assailant hoists the victim into a hanging noose, and kicks a stool out from under him. The death is ruled a suicide. The giant is an assistant to Ahben Vanesku, a cult leader who hires Peter Gunn to find a female cult member who supposedly embezzled $ 200,000 from the c