Which C.S. Lewis book presents a series of conversations between a senior and junior demon?

The Screwtape Letters presents conversations through letters between a senior and junior demon.

Published in book form in 1942, the work consists of correspondence from Screwtape, an experienced demon, to his nephew Wormwood. Screwtape offers advice on tempting a human subject, while Lewis uses the demonic viewpoint to satirize human weakness and expose habits such as distraction, vanity, resentment, and self-deception.

The book began as a series of letters published in the Anglican newspaper The Guardian during 1941. Lewis’s decision to write from the viewpoint of a demon creates an important reversal: readers must infer the author’s moral position from advice that is deliberately corrupt.

The Screwtape Letters is not a conventional novel with a continuous plot. It is an epistolary work, meaning it is built from letters. Its fictional demons are also distinct from the nonfiction Christian arguments in books such as Mere Christianity and The Problem of Pain.