Guest Stars Helen Shingler as Mme. Maigret Neville Jason as Lapointe Anthony Jacobs as Joseph Noel Howlett as Comeliau Carl Duering as Victor Eddie Malin as Locksmith Gwen Cherrell as Louise Sheila Robins as Martine David Courtney as Felix Cicely Paget-Bowman as Madame Gaillardin Derek Benfield as Emile Pauline Letts as Madame Fumal Eric Pohlmann as Fumal Uncredited John Hart as Character in Corridor
