Charlie Chan's Secret

Warner Oland

Charlie Chan

Rosina Lawrence

Alice Lowell

Charles Quigley

Dick Williams

Henrietta Crosman

Mrs. Henrietta Lowell

Edward Trevor

Fred Gage

Astrid Allwyn

Janice Lowell Gage

Herbert Mundin

Baxter

Egon Brecher

Ulrich

?

Gloria Roy

Madame Carlotta Bowen

Ivan Miller

Morton of Homicide

Arthur Edmund Carewe

Professor Bowen

Jonathan Hale

Warren T. Phelps

Jerry Miley

Allen Colby

William Bailey

Det. Harris

Francis Ford

Captain of salvage ship