Guest Stars Helen Shingler as Mme. Maigret Victor Lucas as Torrance Michael Golden as Lock-Keeper Bruno Barnabe as Pozzo Ballard Berkeley as Dr. Pardon Trader Faulkner as Lussac Zorenah Osborne as Julie Philip Madoc as Popaul Brenda Cowling as Mme. Pardon Terence de Marney as Colonel Lalinde Patricia Laffan as Christine Pat Pleasance as Annette Duche