From the back of the book: The Final Revelation for Trail Of Cthulhu collects for the first time the four sanity-destroying Purist adventures written by award winning RPG writer Graham Walmsley. Scott Dorward links them in a disturbing campagin set in Britain in the 1930s, from which there is no escape, no comfort, and no salvation when faced with the Mythos; your only choces death, insanity or a quiet life with a shattered mind.