Written in the form of letters, The Screwtape Letters by C. S. Lewis is an amusing and insightful correspondence between a senior devil, Screwtape, and his obstreperous and incompetent nephew, Wormwood, a "young fiend." All of the letters are from Screwtape to Wormwood, and the subject of the correspondence is a human being, newly converted to Christianity, whom Screwtape refers to as "the patient." Throughout the correspondence, Screwtape tries to help Wormwood tempt the patient away from Heaven and into Hell. He encourages his nephew's successes, suggests various and devious ways to enter the man's thoughts and influence him, and berates Wormwood for his failures as the man begins attending church, goes through various ups and downs of faith, falls in love with a Christian girl, and is called to service in the War. All in all, the letters and "Screwtape Proposes a Toast," the last chapter of the book, are a witty and cautionary commentary on the state of the modern human soul.