Mysterious Intruder

Richard Dix

Don Gale

Barton MacLane

Detective Taggart

Nina Vale

Joan Hill, Gale's Secretary

Regis Toomey

James Summers

Helen Mowery

Freda Hanson

Mike Mazurki

Harry Pontos

Pamela Blake

Elora Lund

Charles Lane

Detective Burns

Paul E. Burns

Edward Stillwell

Kathleen Howard

Rose Denning

Harlan Briggs

Mr. Brown

Jessie Arnold

Woman in Window (Uncredited)

Stanley Blystone

Henry (Uncredited)

Jack Carrington

Bartender (Uncredited)

Eddy Chandler

Cop in Squad Car (Uncredited)

Kernan Cripps

Kelly (Uncredited)

Edith Evanson

Mrs. Ward (Uncredited)

Otto Forrest

The Whistler (Voice) (Uncredited)

Martín Garralaga

Detective (Uncredited)

Selmer Jackson

Dr. Connell (Uncredited)

Charles Jordan

Desk Clerk (Uncredited)

Donald Kerr

Reporter (Uncredited)

Joe Palma

Police Guard Outside Stillwell's Store (Uncredited)

Arthur Space

Davis (Uncredited)

William Castle

Director