Directed by Peter Sadsy (Countess Dracula (1971) and Hands of the Ripper (1971)), this uncomfortable chiller based upon John Blackburn's novel was optioned by Christopher Lee as a potential vehicle for Hammer, they refused it, so he took it to Rank, who were more than happy to produce it. Hammer's loss was Rank's gain, and this is a precursor to what Lee did in The Wicker Man. Three trustees of the Van Traylen fund, which has a children's home on the Scottish island of Bala, have all died in suspicious circumstances, they look like suicide, but they aren't. They all have a young girl in common, Mary Valley (Gwyneth Strong), who is in hospital traumatised by something, and her mother Anna Harb (Diana Dors) is abusive. Police Colonel Bingham (Lee) teams up with hospital supervisor Sir Mark Ashley (Peter Cushing) to find out what's going on. The murders continue, even with Mary in hospital. So Bingham and Ashley travel to Bala to the children's home to see if they can get to the bottom of it, and it gets more sinister. It's a slow burner, but it builds up to a shocking and unforgettable finale that no-one would get away with in films these days. But, it builds up brilliantly, and it's well made and it's got good support from Keith Barron, Fulton Mackay and Michael Gambon in his first film role.