Charles Laughton

Inspector Jules Maigret

Franchot Tone

Johann Radek

Burgess Meredith

Joseph Heurtin

Robert Hutton

Bill Kirby

Jean Wallace

Edna Wallace

Patricia Roc

Helen Kirby

Belita

Gisella Heurtin

William Phipps

Janvier

Wilfrid Hyde-White

Professor Grollet

Howard Vernon

Inspector (uncredited)