An arson investigator goes undercover to break up a ring that sets fires in order to collect the insurance.

Robert Lowery
as Joe Martin

Anne Gwynne
as Jane Jennings

Edward Brophy
as Pete Purdy

Marcia Mae Jones
as Betty - Fender's Secretary

Douglas Fowley
as Frederick P. 'Fred' Fender

Maude Eburne
as Grandma

William Forrest
as Deputy Fire Chief / Narrator

Steve Pendleton
as Murph, the undercover man (as Gaylord Pendleton)

Byron Foulger
as Thomas Peyson

Matt McHugh
as Hubbell