"Screwtape" refers to "The Screwtape Letters," a satirical novel by C.S. Lewis published in 1942. The book is written in the form of letters from a senior demon, Screwtape, to his inexperienced nephew, Wormwood, providing guidance on how to tempt and corrupt a human known as the "Patient." The narrative explores themes of morality, temptation, and the nature of good and evil. Through Screwtape's advice, readers gain insight into the subtle ways in which individuals can be led astray from their faith and virtues, highlighting the spiritual struggles faced by humanity.