Holmes and Watson are pitted against arch-enemy Professor Moriarty, who is planning to steal a top secret invention.
Director: Roy William Neill
Producer: Howard Benedict
Producer: Roy William Neill
Actor: Kaaren Verne
Actor: Lionel Atwill
Actor: Nigel Bruce
Actor: William Post Jr.
Actor: William Post
Actor: Jr.
Actor: Basil Rathbone
Actor: Dennis Hoey
Actor: George Burr McAnnan
Actor: George Eldredge
Actor: Guy Kingsford
Actor: Harold de Becker
Actor: Harry Cording
Actor: Harry Woods
Actor: Henry Victor
Actor: Holmes Herbert
Actor: Hugh Herbert
Actor: James Craven
Actor: John Burton
Actor: Leslie Denison
Actor: Leyland Hodgson
Actor: Mary Gordon
Actor: Paul Bryar
Actor: Paul Fix
Actor: Philip Van Zandt
Actor: Rudolph Anders