London, 1949. John Christie is an unassuming, middle aged man who, along with his wife Ethel, manages the apartment building at 10 Rillington Place. His unassuming demeanor masks the fact of being a serial killer. His modus operandi is to act as a person with a medical background, lure unsuspecting women to his apartment on the pretense of curing them of some ailment, knock them unconscious with carbon monoxide gas, gain his sexual release through contact with the unconscious body, then strangle the victim dead before disposing of the body usually by burying it in his back yard. His next intended target is Beryl Evans, a young woman who has just moved into a flat in his building. Beryl's husband, Tim Evans, is an illiterate man who likes to put on airs. Already with an infant daughter named Geraldine, the Evanses learn they are going to have another baby, which they cannot afford to have.