All 12 jury members who sent an innocent man to the gallows are gathered together for a demonstration of how convictions can be made on circumstantial evidence. During the proceedings, a phony murder is quickly revealed as the real thing.

John Darrow
as Jimmy Allen - the Auto Salesman

Gloria Shea
as Helen Mason - the Secretary

Hale Hamilton
as J.E.Burton - the Attorney

Wilfred Lucas
as John Davis

J. Frank Glendon
as Robert Crandall - the Butler

Michael Visaroff
as Edwards - the Caretaker

Jack Pennick
as The Plumber

Jerry Mandy
as Tony Scabolotto - the Barber

Lew Kelly
as Smith - the Insurance Agent

Jane Keckley
as Mrs. Reed - the Seamstress