Please answer the following question: Nightmare is a 1942 American thriller film directed by Tim Whelan and starring Diana Barrymore Brian Donlevy and Henry Daniell. Diana Barrymore plays Leslie Stafford a secretary who seeks the help of a home invader (Brian Donlevy) to dispose of the body of her murdered husband in wartime London.The film was based on a novel of the same name by Philip MacDonald. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Film