Director
H. Bruce Humberstone
DIRECTOR
Stars (in credits order)
Warner Oland
Charlie Chan
Boris Karloff
Gravelle
Keye Luke
Lee Chan
Charlotte Henry
Mlle. Kitty
Thomas Beck
Phil Childers
Margaret Irving
Mme. Lilli Rochelle
Gregory Gaye
Enrico Barelli
Nedda Harrigan
Mme. Anita Barelli
Frank Conroy
Mr. Whitely
Guy Usher
Inspector Regan
William Demarest
Sgt. Kelly
Maurice Cass
Mr. Arnold
Tom McGuire
Morris
William Bailey
Detective (uncredited)
Charles Bancroft
Soldier in Opera (uncredited)
John Bleifer
Orderly (uncredited)
Stanley Blystone
Backstage Cop Who Shoots Gravelle (uncredited)
Myrta Bonillas
Villager in Opera (uncredited)
Paul Bradley
Raymond Brown
Guard (uncredited)
Steve Carruthers
Opera Spectator (uncredited)
Carita Crawford
Dancer in Opera (uncredited)
Patrick Cunning
Zari Elmassian
Mme. Rochelle (uncredited) (singingVoice)
Frank Fanning
Cop (uncredited)
Jim Farley
Adolph Faylauer
Larry Fisher
Benson Fong
Opera Supernumerary (uncredited)
J.C. Fowler
Otto Fries
Innkeeper (uncredited)
Bud Geary
Milton Gowman
Herschel Graham
Stagehand (uncredited)
Harrison Greene
Julia Griffith
Cliff Herd
Charles Anthony Hughes
Ambulance Doctor (uncredited)
Selmer Jackson
Hudson - Wire-Photo Technician (uncredited)
Gladden James
Regan's Secretary (uncredited)
Jane Keckley
2nd Wardrobe Woman (uncredited)
Fred Kelsey
Dugan - Policeman (uncredited)
Marc Lawrence
Usher (uncredited)
Leonard Mellon
Tony Merlo
Dodo Newton
Barmaid in Opera (uncredited)
Eddie Parker
Richard Powell
Enrique de Rosas
Florist (uncredited)
Tony Roux
Dick Rush
Loretta Russell
Alexander Schoenberg
Prompter (uncredited)
Eddie Shubert
Lee Shumway
Sanitarium Guard (uncredited)
Mary Louise Smith
Harry Strang
Eddie Tamblyn
Call Boy (uncredited)
Marjorie Timm
Harland Tucker
Private Detective (uncredited)
Hilda Vaughn
Agnes - Wardrobe Woman (uncredited)
Emmett Vogan
Smitty - Wire-Photo Technician (uncredited)
Billy Wayne
Electrician (uncredited)
Tudor Williams
Gravelle's Singing Voice (uncredited) (voice)
Joan Woodbury