The Screwtape Letters by C.S. Lewis, published in 1963 by Time-Life, is a classic trade paperback book written in English. This collection of letters is a fictional correspondence between a senior demon and his apprentice as they plot to tempt and ensnare a human soul. The Screwtape Letters offers a unique perspective on the inner workings of Satan's minions and is a timeless piece of Christian literature that continues to resonate with readers today.