Answer
"Double Indemnity", the film directed by Billy Wilder, was an adaptation of James M. Cain's 1943 novel of the same name. Cain's crime fiction masterpiece tells the dark tale of Walter Neff, an insurance salesman drawn into a web of deceit, murder, and manipulation by the seductive Phyllis Dietrichson. The novel explores the sinister side of human desire, greed, and the consequences of one's actions.