Guest Stars Helen Shingler as Mme. Maigret John Moore as Blanchard Marjorie Wilde as Leontine David Grahame as Monsieur Lachaume Robert Young as Court Usher Alan Wheatley as Grandmaison Peter Thompson as Warder Sheila Ballantine as Raymonde Alan Rowe as Alain Vernoux Reginald Jessup as Richet Ray Grover as Man in the Cafe Norman Scace as Inspector Feron John Caesar as Labourer Julian d'Albie as Robert de Courcon Jon Rumney as Lomel Shirley Cain as Jeanne Vernoux Edward Chapman as Hubert Vernoux Margaret Rawlings as Madame Vernoux Wynne Clark as Madame Chabot Henry Manning as A Doctor Philip Howard as Cafe Proprietor Patrick Scanlan as Clerk Charles Maunsell as Arsene