When Dr Raymond Ferens moves to a practice at Milham in the Moor in north Devon, he and his wife are enchanted with the beautiful hill-top village lying so close to moor and sky. At first they see only its charm, but soon they begin to uncover its secrets envy, hatred and malice. Everyone says that Sister Monica, warden of a children's home, is a saint but is she? A few months after the Ferens' arrival her body is found drowned in the mill-race. Chief Inspector Macdonald faces one of his most difficult cases in a village determined not to betray its dark secrets to a stranger.