What is the title of C.S. Lewis’s 1942 book about temptation narrated by a senior devil?

The Screwtape Letters is C.S. Lewis’s 1942 book about temptation narrated by a senior devil.

The work is structured as a series of letters from Screwtape, an experienced demon, to his inexperienced nephew Wormwood. Screwtape offers advice on how to tempt a human patient, while Lewis uses the inverted viewpoint to satirize human weaknesses and expose habits such as vanity, distraction, resentment, and self-deception.

Although the narrator is demonic, the book is a Christian moral and apologetic work rather than a celebration of evil. Its perspective allows Lewis to make familiar spiritual dangers look strange by describing them as professional techniques. The correspondence format also gives the book a distinctive comic and sharply observant style.

The Screwtape Letters first appeared in installments in the Anglican newspaper The Guardian before being published as a book. It is often confused with The Great Divorce, another Lewis work dealing with spiritual themes, but that book uses a very different allegorical journey and was published in 1945.