Charlie Chan
Warner Oland
Gravelle
Boris Karloff
Phil Childers
Thomas Beck
Mr. Arnold
Maurice Cass
Pop Morris - Stage Doorman
Tom McGuire
Undetermined Minor Role (uncredited) (unconfirmed)
Marc Lawrence
Dancer in Opera (uncredited)
Joan Woodbury
Detective (uncredited)
William Bailey
Soldier in Opera (uncredited)
Charles Bancroft
Murdered Orderly (uncredited)
John Bleifer
Backstage Cop Who Shoots Gravelle (uncredited)
Stanley Blystone
Villager in Opera (uncredited)
Myrta Bonillas
Lee Chan
Keye Luke
Guard (uncredited)
Raymond Brown
Carita Crawford
Patrick Cunning
Mme. Rochelle (singing voice) (uncredited)
Zari Elmassian
Cop (uncredited)
Frank Fanning
Jim Farley
Opera Spectator (uncredited)
Adolph Faylauer
Larry Fisher
Opera Supernumerary (uncredited)
Benson Fong
J. C. Fowler
Sergeant Kelly
William Demarest
Innkeeper (uncredited)
Otto Fries
Bud Geary
Milton Gowman
Herschel Graham
Harrison Greene
Julia Griffith
Inspector Regan
Guy Usher
Mme. Lilli Rochelle
Margaret Irving
Enrico Borelli
Gregory Gaye
Mme. Lucretia Borelli
Nedda Harrigan
Mr. Whitely
Frank Conroy
Mlle. Kitty
Charlotte Henry
Music
Oscar Levant
Director
H. Bruce Humberstone
Executive Producer
Sol M. Wurtzel
Writer
Charles Belden
Characters
Earl Derr Biggers
Director of Photography
Lucien N. Andriot
Editor
Alex Troffey
Costume Design
Herschel McCoy