The Screwtape Letters is a Christian apologetic novel by C. S. Lewis and dedicated to J.R.R. Tolkien. A milestone in the history of popular theology, 'The Screwtape Letters' is an iconic classic on spiritual warfare and the power of the devil. It is a timeless classic on spiritual conflict and the invisible realities which are part of our religious experience. The story takes the form of a series of letters from a senior demon Screwtape to his nephew Wormwood, a Junior Tempter. The uncle's mentorship pertains to the nephew's responsibility in securing the damnation of a British man known only as ""the Patient"". C.S. Lewis's The Screwtape Letters is the most engaging account of temptation-and triumph over it-ever written.