C.S. Lewis' "The Screwtape Letters" is a diabolically clever read. In this book Lewis writes a series of letters between two devils that are attempting to keep "the patient" in the grasps of the underworld. The techniques that are described will be familiar to anyone that has a conscience, or a soul. It is quite possible that the way Evil works is exactly as Lewis describes it in these letters. The book will make you think about the way you live, and if Evil is being succesfull in fooling you into thinking you are on the right path.This is a masterful book.