•
Terrence Hardiman as Chief Supt. Franks •
Michael Denison as Captain Aubrey Percival • Marianne Borgo as Gabrielle •
Daniel Hill as Inspector Clark •
Jack McKenzie as Chief Inspector Perry • Neville Jason as Constant Delangre •
Tamara Ustinov as WPC Baker •
Mary Wimbush as Agatha •
Ian Cullen as Inspector Hallisay • James Kennedy as Mr. X •
Tom Chadbon as Dr. Ormiston ==References==