"Sherlock Holmes investigates a series of so-called "pajama suicides". He knows the female villain behind them is as cunning as Moriarty and as venomous as a spider."
Basil Rathbone
as Sherlock Holmes
Nigel Bruce
as Dr. John H. Watson
Gale Sondergaard
as Adrea Spedding
Dennis Hoey
as Insp. Lestrade
Vernon Downing
as Norman Locke
Alec Craig
as Radlik
Arthur Hohl
as Adam Gilflower
Mary Gordon
as Mrs. Hudson
Teddy Infuhr
as Larry (uncredited)
Donald Stuart
as Artie - Shooting Gallery Attendant (uncredited)
Harry Cording
as Fred Garvin (uncredited)
Belle Mitchell
as Fortune Teller (uncredited)
Angelo Rossitto
as Obongo - Pygmy (uncredited)
Sylvia Andrew
as Charwoman (uncredited)
Marie De Becker
Jimmy Aubrey
as News Vendor (uncredited)
Brandon Beach
as Carnival Patron (uncredited)
Frank Benson
as Toy Doll Attendant (uncredited)
Lydia Bilbrook
as Susan (uncredited)
John Burton
as Radio Announcer (uncredited)
James Carlisle
as Casino Patron (uncredited)
Jack Deery
George Kirby
Stanley Logan
as Robert (uncredited)
Wilbur Mack
Edmund Mortimer
William H. O'Brien
as Doorman (uncredited)
John Roche
as Casino Croupier (uncredited)
Gene Roth
as Henchman Taylor (uncredited)
Arthur Stenning
as Plainclothesman (uncredited)
Florence Wix
Herschel Graham
Ethelreda Leopold
Edward R. Robinson
Set Decoration
Bertram Millhauser
Screenplay
Vera West
Costume Design
Roy William Neill
Director
Producer
John B. Goodman
Art Direction
Charles Van Enger
Director of Photography
William Austin
Editor
Russell A. Gausman
Martin Obzina
Hans J. Salter
Music Director
Bernard B. Brown
Sound Director
Arthur Conan Doyle
Story