London, 1953. Police discover the bodies of three young women hidden in a wall at 10 Rillington Place, a dingy terrace house in Notting Hill. On searching the building, they find another body beneath the floorboards, then an array of human bones in the garden. But they have already investigated a double murder at 10 Rillington Place, three years ago, and the killer was hanged. Did they get the wrong man?