Which C.S. Lewis book is presented as a series of letters from the demon Screwtape?

The Screwtape Letters is presented as a series of letters from the senior demon Screwtape.

Published in book form in 1942, the work uses an inverted viewpoint: Screwtape advises his inexperienced nephew Wormwood on how to tempt a human being. Lewis uses this fictional correspondence to discuss moral choices, distraction, pride, resentment, and spiritual self-deception.

The book began as a set of pieces connected with Lewis’s wartime broadcasting and public religious writing, but it is distinct from Mere Christianity, which developed from his BBC talks. The epistolary form gives the satire its unusual structure and allows Lewis to describe ordinary weaknesses from the perspective of a tempter.

Screwtape is not the human character being tempted, and Wormwood is not the narrator. The letters come from Screwtape, while Wormwood is the junior demon receiving advice. The work remains one of Lewis’s most widely read theological satires.