What is the title of C.S. Lewis's 1942 book written as a series of letters from a demon?

C.S. Lewis's 1942 book written as letters from a demon is The Screwtape Letters. The book presents correspondence from Screwtape, an experienced demon, to his inexperienced nephew Wormwood, who is assigned to influence a human subject.

Lewis uses the fictional letters to satirize temptation, self-deception, pride, distraction, and other weaknesses. The demonic narrator gives readers an intentionally inverted view of moral and spiritual life, so the advice is meant to expose harmful behavior rather than endorse it.

The work first appeared in serial form in the Anglican newspaper The Guardian in 1941, before being published as a book in 1942. Lewis later said that writing from the viewpoint of a devil was uncomfortable and difficult.

The title character is Screwtape, while Wormwood is his nephew and correspondent. This distinction is a common source of confusion when identifying the book’s central figures.