What is the title of C.S. Lewis’s book of letters from the demon Screwtape to Wormwood?

C.S. Lewis’s book of letters from the demon Screwtape to Wormwood is The Screwtape Letters.

The book was first published in 1942. It is presented as a series of fictional letters written by Screwtape, an experienced demon, to his inexperienced nephew Wormwood. Screwtape offers advice about tempting a human patient, allowing Lewis to discuss moral weakness, pride, distraction, habit, and spiritual choice through ironic demonic commentary.

Lewis uses the letters’ inverted perspective as a literary device. The demons describe harmful behavior as success and virtue as a threat, so readers must reverse the advice to understand the Christian argument. The unusual format also lets Lewis examine ordinary decisions rather than relying on a conventional narrative about supernatural events.

The book became one of Lewis’s most widely read works of Christian apologetics. It is frequently confused with The Great Divorce, another Lewis work involving a fantastical setting, but that book uses a very different narrative structure.