"A mad scramble for stolen loot ensues after Boston Blackie has prisoners released for work in a wartime defence plant."
Chester Morris
as Horatio 'Boston Blackie' Black
Erik Rolf
as Dooley Watson
Jeanne Bates
as Mary Watson
Richard Lane
as Insp. John Farraday
George E. Stone
as The Runt
Lloyd Corrigan
as Arthur Manleder
Douglas Fowley
as Nails Blanton (Uncredited)
Sid Melton
as Benny Hines (Uncredited)
Ray Teal
as Policeman Joe (Uncredited)
Maude Eburne
as Edna Counihan (Uncredited)
Arthur Hunnicutt
as Elwood "Tex" Stewart (Uncredited)
Cy Kendall
as Jumbo Madigan (Uncredited)
Larry Olsen
as Johnny Watson (Uncredited)
Pierre Watkin
as State Governor Rutledge (Uncredited)
Walter Sande
as Detective Sergeant Matthews (Uncredited)
Jack Carr
as Carpet Man (Uncredited)
Richard Alexander
George Anderson
as Warden J.A. Edwards (Uncredited)
Jessie Arnold
as Woman in Hallway (Uncredited)
Trevor Bardette
as Manny Vogel (Uncredited)
Eddie Bruce
as Sandy (Uncredited)
Sally Cairns
as Richie Adair (Uncredited)
Eddy Chandler
as Policeman Frank (Uncredited)
James Conaty
as Parole Board Member (Uncredited)
Heinie Conklin
as Police Desk Sergeant (Uncredited)
Marie De Becker
as Miss Bailey (Uncredited)
Sayre Dearing
as Reporter at Parole Board Hearing (Uncredited)
Minta Durfee
Ben Erway
as Prison Warden Root (Uncredited)
Jerry Frank
as George Phillips (Uncredited)
Joel Friedkin
as Joe Painter (Uncredited)
Kit Guard
as Wilfred Thompson (Uncredited)
John Harmon
as Red Taggart (Uncredited)
Carl M. Leviness
George Magrill
as Policeman (Uncredited)
Al Murphy
as William Jones (Uncredited)
Forbes Murray
as Chairman of Parole Board (Uncredited)
Frank O'Connor
Brian O'Hara
as Parker Gray (Uncredited)
Dick Rush
as Policeman Lally (Uncredited)
Harry Semels
as Jerome Wagner (Uncredited)
John Tyrrell
as Driver (Uncredited)
Bobby Hale
as British Newsman (uncredited)
William Castle
Director
Jack Boyle
Characters
Paul Yawitz
Writer
Wallace MacDonald
Producer
Ernest Miller
Director of Photography
Jerome Thoms
Editor
Lionel Banks
Art Direction
Paul Murphy
Robert Priestley
Set Decoration
Clay Campbell
Makeup Artist
Earl Bellamy
Assistant Director
Earl Snyder
Sound Engineer
Morris Stoloff
Music Director
Sidney Cutner
Additional Music
Werner R. Heymann
Friedrich Hollaender
Ben Oakland
George Parrish
Gregory Stone
Eddie Parker
Stunts
Matty Roubert
Chuck Hamilton