Who co-wrote the 1942 fantasy novel The Screwtape Letters with C.S. Lewis?

Nobody co-wrote The Screwtape Letters; C.S. Lewis wrote it alone.

The Screwtape Letters is an epistolary work by Lewis, first published in book form in 1942. It presents a series of fictional letters from Screwtape, a senior demon, to his inexperienced nephew Wormwood. The correspondence discusses temptation and human moral choices from a deliberately inverted perspective.

Lewis’s close friendships with other members of the Inklings can cause confusion about authorship. J.R.R. Tolkien, Charles Williams, and Owen Barfield were important literary associates, but none co-wrote this book. The distinctive voice and structure belong to Lewis.

The work first appeared in installments in the Anglican newspaper The Guardian before its collected publication. Its satirical method makes the reader infer the moral framework from advice offered by the demons, rather than receiving a conventional sermon directly from a human narrator.