an Entity references as follows:
Negatives is a 1968 British drama film directed by Peter Medak. Based on the 1961 novel Negatives by Peter Everett, it features Peter McEnery and Glenda Jackson as Theo and Vivien, a couple who act out their erotic fantasies by dressing up as the Edwardian murderer Hawley Harvey Crippen and his lover Ethel le Neve. Diane Cilento plays Reingard, a German photographer who becomes involved in their private world.