Michael Truman Director Ian Hendry Insp. Birkett Actor Ronald Fraser Sgt. Saunders Actor Margaret Johnston Mrs. Gray Actor Natasha Parry Perlita Barker Actor Patrick Holt Walbrook Actor Peter Arne Hammond Barker Actor Jeremy Brett Jordan Barker Actor Robert Harris William Lamotte Actor Rosalie Crutchley Maude Klein Actor Marie Burke Madame Lavalle Actor James Villiers David Dane Actor Jane Asher Lindy Birkett Actor Duncan Macrae Barney Actor Zena Walker Mildred Birkett Actor Alan White Insp. Blackwell Actor Martin Boddey Inspector Actor Griffith Davies Teddy Boy Actor Gabrielle Brune Lamotte's Secretary Actor Vivienne Knight Writer Patrick Campbell Writer