Task: Explanation
Input (English): This Man Must Die (French: Que la bête meure ), American title The Beast Must Die, is a 1969 French and Italian thriller film directed by Claude Chabrol. The story is based on a 1938 novel by Cecil Day-Lewis, writing as Nicholas Blake, "The Beast Must Die". The film had a total of 1,092,910 admissions in France. Question: What type of stories did the author of the 1938 novel This Man Must Die use the pseudonym of Nicholas Blake? Answer: mystery stories
Output (English):  The story is based on a 1938 novel by Cecil DayLewis, writing as Nicholas Blake, The Beast Must Die.