Which C.S. Lewis book is a collection of letters from a senior demon to a junior demon?

The Screwtape Letters is C.S. Lewis’s collection of letters from a senior demon to a junior demon.

Published in book form in 1942, the work consists of advice written by Screwtape to his nephew Wormwood, a junior tempter. Lewis reverses the viewpoint: readers hear demonic instruction about temptation, distraction, pride, and spiritual complacency rather than receiving direct advice from an angelic narrator.

The epistolary structure gives the book its distinctive voice. Screwtape’s confident explanations often expose the weaknesses of the demonic strategy, creating irony as well as satire. Lewis uses the fictional correspondence to discuss Christian moral psychology in an accessible form.

The book is sometimes described as a conventional novel, but it is better classified as a satirical theological work made up of letters. Screwtape is the senior demon, while Wormwood is the inexperienced recipient.