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
Lelah Tyler
as Mrs. Peyson
Emmett Vogan
as Al, Night Watchman
