Guest Stars Orla Brady as Countess Vera Rossakoff Eleanor Tomlinson as Alice Cunningham Tom Wlaschiha as Mr. Schwartz Tom Austen as Ted Williams Fiona O'Shaughnessy as Katrina Samoushenka Nigel Lindsay as Francesco Morven Christie as Elsie Clayton Rupert Evans as Harold Waring Simon Callow as Dr. Lutz Richard Katz as Gustave Sandy McDade as Annabel Rice Stephen Frost as Chief Inspector Lorna Nickson-Brown as Lucinda LeMesurier Isobel Middleton as Policewoman Patrick Ryecart as Sir Anthony Morgan Tom Chadbon as Dr. Burton Nicholas McGaughey as Insp. Lementeuil