Which C.S. Lewis book presents correspondence from a senior demon to his nephew?

The Screwtape Letters presents correspondence from a senior demon to his nephew.

Published in book form in 1942, The Screwtape Letters consists of fictional letters from Screwtape, an experienced tempter, to Wormwood, a junior demon assigned to influence a human known as “the Patient.” Lewis uses the reversed perspective to satirize temptation, self-deception, pride, distraction, and spiritual complacency.

The unusual format originated in a series of pieces Lewis wrote for broadcast during wartime. The letters are not a handbook of demonic beliefs; they are a Christian moral and theological satire in which the demons’ advice reveals the errors Lewis wants readers to recognize.

Readers sometimes confuse the book with Mere Christianity because both grew out of Lewis’s Christian broadcasts and apologetic work. Mere Christianity presents arguments and explanations directly, while The Screwtape Letters communicates through irony and fictional correspondence.