Richard Attenborough delivers an outstanding performance in this unsettling and factual account centered on John Christie. He portrays a man who shares his residence with his wife, Ethel (played by Pat Heywood), on the ground floor of a building where Beryl (Judy Gleeson) and Timothy Evans (John Hurt), a young couple expecting a baby, have recently taken up residence above them. However, unbeknownst to this couple, C…