When Darkness Falls is a 1960 Swedish thriller film directed by Arne Mattsson. The film is based on Maria Langs 1954 novel Tragedi på en lantkyrkogård. The film stars Nils Asther, Karl-Arne Holmsten, Birgitta Pettersson, Elsa Prawitz, Adolf Jahr, Mimi Nelson and George Fant. It was shot at the Centrumateljéerna Studios in Stockholm. The film's sets were designed by the art director Barbro Lindström. It was followed by a sequel Lovely Is the Summer Night in 1961.