Charlie Chan

Warner Oland

Gravelle

Boris Karloff

Lee Chan

Keye Luke

Mlle. Kitty

Charlotte Henry

Sergeant Kelly

William Demarest

Inspector Regan

Guy Usher

Phil Childers

Thomas Beck

Mme. Lilli Rouchelle

Margaret Irving

Enrico Barelli

Gregory Gaye

Mme. Lucretia Barelli

Nedda Harrigan

Mr. Whitely

Frank Conroy

Mr. Arnold

Maurice Cass

Pop Morris - Stage Doorman

Tom McGuire

Undetermined Minor Role (uncredited) (unconfirmed)

Marc Lawrence

Cop

Fred Kelsey

Newspaper Wire-Photo Technician

Selmer Jackson

Dancer in Opera (uncredited)

Joan Woodbury

Newspaper Wire-Photo Technician

Emmett Vogan

Detective (uncredited)

William Bailey

Opera Supernumerary (uncredited)

Benson Fong

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

Guard (uncredited)

Raymond Brown

Dancer in Opera (uncredited)

Carita Crawford

Villager in Opera (uncredited)

Patrick Cunning

Mme. Rochelle (singing voice) (uncredited)

Zari Elmassian

Cop (uncredited)

Frank Fanning

Detective (uncredited)

Jim Farley

Opera Spectator (uncredited)

Adolph Faylauer

Cop (uncredited)

Larry Fisher

Opera Spectator (uncredited)

J.C. Fowler

Innkeeper (uncredited)

Otto Fries

Cop (uncredited)

Bud Geary

Villager in Opera (uncredited)

Milton Gowman

Villager in Opera (uncredited)

Herschel Graham

Detective (uncredited)

Harrison Greene

Opera Spectator (uncredited)

Julia Griffith