Charles Lederer Director Lew Ayres Oliver Duffy Actor Laraine Day Edwina "Eddie" Brown Actor Basil Rathbone Cesar Ferrari, alias Dr. H. Santelle Actor Walter Kingsford Dr. Cromwall Actor Miles Mander Dr. Kurt Immelman Actor Charles D. Brown Police Inspector Gallagher Actor Cliff Clark Police Lieutenant Allison Actor James Flavin Police Lieutenant Schaeffer Actor Russell Gleason Ogilvie Actor William Tannen Devlan Actor Mark Daniels Haguey Actor Bert Roach Krum Actor Russell Hicks Dr. Chandley Actor Charles Wagenheim Fred F. Bixley Actor Robert E. Homans Officer O'Garrity Actor Irving Starr Producer Lawrence P. Bachmann Screenwriter Rose Caylor Screenwriter Bronislau Kaper Original Music Daniele Amfitheatrof Original Music Mario Castelnuovo-Tedesco Original Music Charles Lawton Jr. Cinematographer Harry Stradling Sr. Cinematographer George Boemler Film Editing Cedric Gibbons Art Director Edwin B. Willis Set Decoration