With Scotland Yard puzzled by a serial killer, and with himself already being warned off by the perpetrating “Marquis”, amateur sleuth “Paul Temple” (John Bentley) and his wife “Steve” (Patricia Dainton) are drafted in by “Sir Graham” (Peter Gawthorne) to help “Insp. Ross” (Ronald Leigh-Hunt) with the investigation. Pretty swiftly, with the body co…