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

William Clemens