Special Guest Stars Honor Blackman as Lillian Stanhope Richard Pearson as Diver, the Pathologist John Fraser as Det. Sgt. O'Keefe Guest Stars Richard Basehart as Nicholas Frame Bernard Fox as Det. Chief Supt. William Durk John Williams as Sir Roger Haversham Wilfrid Hyde-White as Tanner, the Butler Co Starring Arthur Malet as Fenwick Hedley Mattingly as Customs Man John Orchard as Country Constable Charlie Harvey Jason as The Director Peter Church as Constable Sharon Johansen as Miss Dudley Walker Edmiston as Gardener Gerald S. Peters as Inspector Smythe Ronald Long as Mr. Jones Uncredited Dick Cherney as Airport Security John Wilder as Man in Pub Don Knight voices Stagehand outside dressing room
