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The Screwtape Letters is a satirical Christian apologetics novel written in epistolary style by C.S. Lewis, first published in book form in February 1942. The story takes the form of a series of letters from a senior demon, Screwtape, to his nephew, a junior "tempter" named Wormwood, so as to advise him on methods of securing the damnation of a British man, known only as "the Patient".
Probably one of the best movie versions of a book