Warner Oland

Charlie Chan

Acting

Boris Karloff

Gravelle

Acting

Keye Luke

Lee Chan

Acting

William Demarest

Sergeant Kelly

Acting

Guy Usher

Inspector Regan

Acting

Margaret Irving

Mme. Lilli Rochelle

Acting

Gregory Gaye

Enrico Borelli

Acting

Nedda Harrigan

Mme. Lucretia Borelli

Acting

Frank Conroy

Mr. Whitely

Acting

Charlotte Henry

Mlle. Kitty

Acting

Thomas Beck

Phil Childers

Acting

Maurice Cass

Mr. Arnold

Acting

Tom McGuire

Pop Morris - Stage Doorman

Acting

Marc Lawrence

Undetermined Minor Role (uncredited) (unconfirmed)

Acting

Joan Woodbury

Dancer in Opera (uncredited)

Acting

William Bailey

Detective (uncredited)

Acting

Charles Bancroft

Soldier in Opera (uncredited)

Acting

John Bleifer

Murdered Orderly (uncredited)

Acting

Stanley Blystone

Backstage Cop Who Shoots Gravelle (uncredited)

Acting

Myrta Bonillas

Villager in Opera (uncredited)

Acting

Raymond Brown

Guard (uncredited)

Acting

Carita Crawford

Dancer in Opera (uncredited)

Acting

Patrick Cunning

Villager in Opera (uncredited)

Acting

Zari Elmassian

Mme. Rochelle (singing voice) (uncredited)

Acting

Frank Fanning

Cop (uncredited)

Acting

Jim Farley

Detective (uncredited)

Acting

Adolph Faylauer

Opera Spectator (uncredited)

Acting

Larry Fisher

Cop (uncredited)

Acting

Benson Fong

Opera Supernumerary (uncredited)

Acting

J. C. Fowler

Opera Spectator (uncredited)

Acting

Otto Fries

Innkeeper (uncredited)

Acting

Bud Geary

Cop (uncredited)

Acting

Milton Gowman

Villager in Opera (uncredited)

Acting

Herschel Graham

Villager in Opera (uncredited)

Acting

Harrison Greene

Detective (uncredited)

Acting

Julia Griffith

Opera Spectator (uncredited)

Acting