C. S. Lewis’s The Screwtape Letters is a sharp, enduring work of moral and theological satire. Framed as a series of letters from the senior devil Screwtape to his inexperienced nephew Wormwood, the book offers an incisive anatomy of temptation—showing how vanity, self-deception, ambition, and materialism can derail a person’s spiritual growth. Through this epistolary device, Lewis illuminates the dynamics of moral struggle and underscores the centrality of human freedom and responsibility. Clear-sighted, witty, and unsettling in its realism, The Screwtape Letters affirms Lewis’s stature as both thinker and stylist, remaining relevant for readers who wish to scrutinize their values and examine the choices that shape character.