A satirical novel written by C.S. Lewis, consisting of a series of letters from a senior demon, Screwtape, to his nephew, Wormwood, who is tasked with tempting a human into sin. Through these letters, Screwtape provides advice on how to manipulate human weaknesses and exploit their flaws to lead them away from faith and virtue. The novel explores themes of morality, temptation, and spiritual warfare from a unique perspective, offering insights into human nature.