Guest Stars Mark Heap as Dr. Moers Leo Staar as Inspector LaPointe Lucy Cohu as Madame Maigret Shaun Dingwall as Inspector Janvier Hugh Simon as Dr. Paul Colin Mace as Inspector Lognon Lorraine Ashbourne as Rosa Alfonsi Adrian Scarborough as Dr. Bloch Sebastian De Souza as Philippe Martinot Adrian Rawlins as Oscar Bonvoisin Tilly Vosburgh as Nathalie Douglas Hodge as Fred Alfonsi Cassie Clare as Tania Olivia Vinall as Arlette Nicola Sloane as The Countess Jane Wood as Mme. Aubin Sara Kestelman as Madame Dussardier Niké Kurta as Betty Gyula Mesterházy as Man at Pissoir Simon Gregor as Grasshopper Alexandra Bakonyi as Genvieve