The Scarlet Clue

Sidney Toler Charlie Chan

Benson Fong Tommy Chan

Mantan Moreland Birmingham Brown, Chauffeur

Robert Homans Capt. Flynn

I. Stanford Jolley Rolf Brot, alias Ralph Brett

Virginia Brissac Mrs. Marsh

Jack Norton Willie Rand

Janet Shaw Gloria Bayne

Ben Carter Ben Carter

Victoria Faust Hulda Swenson / Janet Carter

Helen Deverell Diane Hall

Leonard Mudie Horace Karloss

Reid Kilpatrick Mr. Chester, program announcer

Emmett Vogan Mr. Hamilton

Crane Whitley Henchman Cooper

Kernan Cripps Detective (uncredited)

Charles Jordan Nelson (uncredited)

Kenner G. Kemp Police Radio Expert (uncredited)

Milton Kibbee Herbert Sinclair (uncredited)

Frank Mayo Det. Hodge (uncredited)