James Stephenson

Philo Vance

Margot Stevenson

Hilda Lake

Henry O'Neill

Markham

Edward Brophy

Ryan

Sheila Bromley

Doris Delafield

Ralph Forbes

Tom McDonald

Donald Douglas

Philip Wrede

Martin Kosleck

Gamble

Jimmy Conlin

Dr. Doremus - Coroner

Edward Raquello

Eduardo Grassi

Creighton Hale

Du Bois - Fingerprint Man

Harry Strang

Hennessey - Markham's Assistant

Richard Kipling

Archer Coe

Wedgwood Nowell

Brisbane Coe

Bo Ling

Ling Toy

Terry

MacTavish (uncredited)

Herbert Anderson

First Reporter (uncredited)

Henry Blair

Hans Snauble (uncredited)

Egon Brecher

Austrian Judge (uncredited)

Harry Burns

Capt. Lugo (uncredited)

Yakima Canutt

Sorrento Sailor (uncredited)

Nat Carr

2nd Photographer (uncredited)

Glen Cavender

Train Porter Asked to Send Telegram (uncredited)

Loia Cheaney

Markham's Secretary (uncredited)

Frederick Giermann

Austrian Sergeant (uncredited)

Eddie Graham

Coroner's Assistant (uncredited)

John Harron

Third Reporter (uncredited)

Stuart Holmes

Hertz (uncredited)

William Hopper

Clerk at Hotel Nino in Chicago (uncredited)

Olaf Hytten

Charles (uncredited)

George Irving

Avery (uncredited)

Marion Lessing

Mrs. Fritz Snauble (uncredited)

Rolf Lindau

Aeronautics Department Sentry (uncredited)

Frank Mayo

Doorman (uncredited)

George Reeves

Steamship Clerk (uncredited)

John J. Richardson

4h Reporter (uncredited)

Cliff Saum

Investigator Snitken (uncredited)

Hans Schumm

Nazi Officer at Dock (uncredited)

Frank Wilcox

2nd Reporter (uncredited)

Jack Wise

1st Photographer (uncredited)

Maris Wrixon

Long-Distance Operator (uncredited)

Henry Zynda

Austrian Lieutenant (uncredited)