Christopher Lee ("Col. Bingham") is the retired policeman who recruits the help of renowned pathologist "Sir Mark Ashton" (Peter Cushing) to help out when the trustees of a children's charity start to dying in what, he thinks, are mysterious circumstances. It all starts with a bus crash that left charred remains when there was no fire, and ends up on a remote Scottish island where perhaps even the children at at risk. There's a great deal of over-acting here - especially from Diana Dors as the mother of one of the children "Mary"; and from a young Gwyneth Strong as that very child. Fulton Mackay is really miscast as the chief constable - a man who seems to hold that rank whilst having only about twenty officers and a few dogs; and Georgia Brown's "Miss Foster" investigative journalist role seemed uncertain as to quite what her point in the story was. It is great to see Cushing and Lee together, but neither are on much form here and the whole thing really does lurch, quite absurdly at times, along for 90 minutes. Pretty mediocre television fayre, this.