The inventor of a new top-of-the-line burglar alarm system is kidnapped by a gang in order to get him to help them commit robberies.
Boris Karloff
as David Mallory
Warren Hull
as Jim Travers
Jean Rogers
as Joan Mallory
Alan Baxter
as John Baron aka The Kid
Hobart Cavanaugh
as Petty Louie
Samuel S. Hinds
as Steven Ranger
David Oliver
as Mike Callahan
Ward Bond
as Fingers
Frank Reicher
as Carl - gang engineer
Edwin Maxwell
as Lawyer Kruger
George Cleveland
as Sam Adams - Company Engineer (uncredited)
Ruth Fallows
as Waitress (uncredited)
