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