What is the name of C.S. Lewis’s 1942 novel written as demonic letters?

C.S. Lewis’s 1942 novel written as demonic letters is The Screwtape Letters.

The book is structured as correspondence from Screwtape, an experienced demon, to his inexperienced nephew Wormwood. Screwtape gives advice on tempting a human being, whom the demons call “the Patient.” Lewis uses the reversed viewpoint to satirize self-deception and expose habits that can undermine moral and spiritual life.

The work first appeared in Britain in 1941 as a series in the Anglican newspaper The Guardian, and it was published in book form in 1942. Lewis’s wartime BBC broadcasts and public essays had already made him a prominent Christian communicator.

Although the book is fictional, its epistolary form is deliberately sharp and humorous rather than a literal account of demons. That satirical structure is central to how readers are meant to interpret it.