Guest Stars Keith Marsh as Leon Felicity Kendal as Marcelle Robart Derek Newark as Maurice Constantine Gregory as Jeweller Marius Goring as Henri Thibaud Michael Bates as Delacroix William Dexter as Inspector Banard Gillian Lind as Madame Robart Frank Maher as 1st Thug Inigo Jackson as Stephane Nina Huby as Arlette Terence Yorke as 2nd Thug