Things aren't always as they seem. Is the little Rhode Island carnival just a place of innocent playfulness, or does it house dark secrets? Is the newest exhibit at the Museum of Natural History a crude representation of an elephant, or is it a thing from out of the depths of time? Who would kill for a ceremonial dagger? What mere vision is powerful enough to kill a wizened rabbi? Four Odysseys into Deadly Adventure Curse of the Chthonians contains four detailed scenarios for the Call of Cthulhu roleplaying game, plus an examination of the Kabbalistic science of Gematria which seeks to derive secret or mystical meaning from the very letters that form the words of Scripture and occult texts.