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
Detectiveuncredited
Charles Bancroft
Soldier in Operauncredited
John Bleifer
Orderlyuncredited
Stanley Blystone
Backstage Cop Who Shoots Gravelleuncredited
Myrta Bonillas
Villager in Operauncredited
Paul Bradley
Raymond Brown
Guarduncredited
Steve Carruthers
Opera Spectatoruncredited
Carita Crawford
Dancer in Operauncredited
Patrick Cunning
Zari Elmassian
Mme. Rochelleuncredited,singingVoice
Frank Fanning
Copuncredited
Jim Farley
Adolph Faylauer
Larry Fisher
Benson Fong
Opera Supernumeraryuncredited
J.C. Fowler
Otto Fries
Innkeeperuncredited
Bud Geary
Milton Gowman
Herschel Graham
Stagehanduncredited
Harrison Greene
Julia Griffith
Cliff Herd
Charles Anthony Hughes
Ambulance Doctoruncredited
Selmer Jackson
Hudson - Wire-Photo Technicianuncredited
Gladden James
Regan's Secretaryuncredited
Jane Keckley
2nd Wardrobe Womanuncredited
Fred Kelsey
Dugan - Policemanuncredited
Marc Lawrence
Usheruncredited
Karl Malden
Hospital attendantuncredited
Leonard Mellon
Tony Merlo
Dodo Newton
Barmaid in Operauncredited
Eddie Parker
Richard Powell
Enrique de Rosas
Floristuncredited
Tony Roux
Dick Rush
Loretta Russell
Alexander Schoenberg
Prompteruncredited
Eddie Shubert
Lee Shumway
Sanitarium Guarduncredited
Mary Louise Smith
Harry Strang
Eddie Tamblyn
Call Boyuncredited
Marjorie Timm
Harland Tucker
Private Detectiveuncredited
Hilda Vaughn
Agnes - Wardrobe Womanuncredited
Emmett Vogan
Smitty - Wire-Photo Technicianuncredited
Billy Wayne
Electricianuncredited
Tudor Williams
Gravelle's Singing Voiceuncredited,voice
Joan Woodbury