The Call of Cthulhu Keeper's Companion is an invaluable resource for GMs. New material includes advice for keepers, a lengthy study of Mythos artifacts, a descriptions of many occult books, a discussion of forensic medicine, a thorough revision and expansion of game skills (including nearly two dozen new ones), and the augmented text of the Keeper's Compendium, somewhat updated--forbidden books, secret cults, alien races, and mysterious places. Additional short essays and features round out this book. More than 100,000 words! The original best-selling Keeper's Compendium appeared in 1993, but has been out of print for several years. New to Call of Cthulhu? A battle-scarred veteran of many campaigns? Here is essential guidance and background to help you host Call of Cthulhu games more easily and skillfully. 13 suggestions for Keepers-Common sense and sly applications to improve your games. More than 60 occult books and references summarized, often including titles of individual chapters. A quick Guide to when languages and language forms existed More than 20 items and artifacts not gathered by the rule book, taken from stories an scenarios. Background, pertinent stats, mechanics. Secret cults of Antagonists, allies, and scholars who know too much for safety or sanity. Forensic Medicine, the science and techniques of death investigation, past and present, in cogent detail. Alien races, mysterious places, two short chapters concerning special mysteries of the Mythos, from deep ones and voormis to Atlantis, Yuggoth, and beyond. Skills, expansions, new skills, fresh discussion of skill applications, coverages, and how some skills relate. Plus good cthulhu hunting, and alternate resistance table, feverish study, law enforcement timeline, circumstances of death by state, brainstorming, books and sanity: alternate rules, updated investigator's sheet, etc...The chapters "Forbidden Books," Secret Cults," "Alien Races," and Mysterious Places" originally made up the Keeper's compendium and appear here in corrected or revised form.