The San Francisco area is beset by a series of seemingly random murders without motive or pattern. The police are taunted by phone calls and letters. Could the maniac be the violent truck driver, or the seemingly mild-mannered mailman, or even a cop?

Hal Reed
as Jerry

Bob Jones
as Grover

Ray Lynch
as Sgt. Pittman

Mary Darrington
as First Murder

Frank Sanabek
as Joe

Ed Quigley
as Tony

Bertha Dahl
as Mrs. Crocker

Dion Marinkovich
as Helen

Doodles Weaver
as Doc

Gloria Gunn
as Marilyn