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.