The Screwtape Letters is a series of instructional letters written by Uncle Screwtape, a senior demon, to Wormwood, his inexperienced nephew, on how to tempt and win the soul of his assigned human (referred to throughout the story only as "the patient"). This brilliant work of satire examines the Christian faith from the inverted perspective of the devils in Hell. It is a cautionary tale for Christians to remain vigilant amidst ongoing spiritual warfare for their souls.