The Secret of the Whistler

Richard Dix

Ralph Harrison

Leslie Brooks

Kay Morrell

Michael Duane

Jim Calhoun

Mary Currier

Edith Marie Harrison

Mona Barrie

Linda Vail

Ray Walker

Joseph Aloysius 'Joe' Conroy

Claire Du Brey

Laura - Harrison's Servant

John Hamilton

McLaren aka Mac (uncredited)

Byron Foulger

Jorgensen (uncredited)

Ernie Adams

Arthur Space

Fred 'Snowflake' Toones