"In Chicago, an unemployed actor aims to solve the mystery concerning a string of ax murders, apparently committed by a lunatic."
Lew Ayres
as Oliver Duffy
Laraine Day
as Edwina 'Eddie' Brown
Basil Rathbone
as Cesar Ferrari / Dr. H. Santelle
Walter Kingsford
as Dr. Cromwall
Miles Mander
as Dr. Kurt Immelman
Charles D. Brown
as Police Inspector Gallagher
Cliff Clark
as Police Lieutenant Allison
James Flavin
as Police Lieutenant Schaeffer
Russell Gleason
as Ogilvie
William Tannen
as Devlan
Mark Daniels
as Haguey
Bert Roach
as Krum
Russell Hicks
as Dr. Chandley
Charles Wagenheim
as Fred F. Bixley
Robert Homans
as Officer O'Garrity
Iris Adrian
as Babe Stanton (uncredited)
Margaret Bert
as Mrs. Geversar (uncredited)
Sam Ash
as Theater Stage Manager (uncredited)
Robert Bradford
as Whistles 'Over the Rainbow' (uncredited)
Ralph Brooks
as Dr. Shepherd (uncredited)
Milton Parsons
as Jarvis J. Banhoff (uncredited)
Eddie Buzard
as Tall Newsboy (uncredited)
Bobby Callahan
as Small Newsboy (uncredited)
George M. Carleton
as Meeting Chairman (uncredited)
Eddy Chandler
as Bill (uncredited)
Mary Currier
as Miss Hewitt (uncredited)
Leslie Denison
as Paul (uncredited)
Roger Moore
as Jim (uncredited)
Jules Cowles
as Crazy Man at the Clinic (uncredited)
Ralph Dunn
as Policeman Outside Clinic (uncredited)
William Lally
as Police Sergeant (uncredited)
Dick Midgley
as Police Driver (uncredited)
George Magrill
as Policeman (uncredited)
Arthur Belasco
as Fat Man (uncredited)
Byron Foulger
as Bird Man (uncredited)
Jerry Maren
as Small Boy (uncredited)
Frank Marlowe
as Cabbie with Cat (uncredited)
George Ovey
as Old Man with Telegram (uncredited)
Edna Holland
as Clinic Nurse (uncredited)
Edwin Stanley
as Hospital Doctor (uncredited)
Hooper Atchley
as Ambulance Doctor (uncredited)
Eddie Parker
as Ambulance Driver (uncredited)
Rand Brooks
as Young Reporter (uncredited)
Ernie Alexander
as Reporter (uncredited)
Jack Gardner
James Millican
Mahlon Hamilton
Wally Cassell
as Photographer (uncredited)
Lester Dorr
Arthur O'Connell
Lee Phelps
as Police Telephone Operator (uncredited)
Frances Rafferty
as Clinic Switchboard Operator (uncredited)
Edward Hearn
as Citizen (uncredited)
Joe Yule
King Baggot
as Psychiatrist at Lecture (uncredited)
Brooks Benedict
Frank McLure
Harold Miller
Cyril Ring
Count Stefenelli
Cliff Danielson
as Hotel Clerk (uncredited)
Emmett Vogan
as Hotel Manager (uncredited)
Frank Whitbeck
as Trailer Announcer (Voice) (uncredited)
Ray Teal
as Police Car #12 Driver (uncredited)
David Tihmar
as Dance Teacher (uncredited)
Irving Starr
Producer
Rose Caylor
Screenplay
Charles Lawton Jr.
Director of Photography
Bronislau Kaper
Original Music Composer
Story
Lawrence P. Bachmann
Charles Lederer
Director
Harry Stradling Sr.
George Boemler
Editor
Edwin B. Willis
Set Decoration
Leonid Raab
Orchestrator
William Ferrari
Art Direction
Charles Mandell
Technical Advisor
Cedric Gibbons
Bert Spurlin
Assistant Director
Daniele Amfitheatrof
Douglas Shearer
Sound Director
Howard Shoup
Costume Design
Mario Castelnuovo-Tedesco