The Screwtape Letters by C. S.   Lewis is a classic masterpiece of religious satire that entertains readers with its sly and ironic portrayal of human life and foibles from the vantage point of Screwtape, a highly placed assistant to “Our Father Below. ” At once wildly comic, deadly serious, and strikingly original, C. S. Lewis’s The Screwtape Letters is the most engaging account of temptation—and triumph over it—ever written.