James M. Cain's novel The Postman Always Rings Twice (1934) was adapted for the movies seven times. The most celebrated version was released 75 years ago, when Cain was on a roll - with three film adaptations made from his books in quick succession in the mid 1940s. WNYC's Sara Fishko and guests investigate the appeal of Cain's film noir-friendly style. (Produced in 2011)