What is the name of C.S. Lewis’s 1942 epistolary satire written as demonic correspondence?

C.S. Lewis’s 1942 epistolary satire written as demonic correspondence is The Screwtape Letters.

The book consists of letters from Screwtape, a senior demon, to his inexperienced nephew Wormwood. Screwtape offers advice on tempting a human patient, turning ordinary weaknesses, distractions, pride, and social pressures into tools of spiritual failure. Lewis presents the advice from the demons’ perspective, creating irony because their goals are the opposite of the reader’s moral interests.

The work first appeared in Britain in 1941 and was published in book form in 1942. Its unusual format made abstract moral and theological ideas accessible through fictional correspondence rather than direct argument.

The title is sometimes confused with Lewis’s other apologetic works, including The Problem of Pain and The Great Divorce. Unlike those books, The Screwtape Letters uses a senior devil’s instructions as its central narrative device.