The Two-Headed Serpent is an action-packed, globe-spanning, and high-octane campaign set in the 1930s for Pulp Cthulhu. The heroes face the sinister conspiracies of an ancient race of monsters hell-bent on taking back a world that was once theirs. Working for Caduceus, a medical aid organisation, the heroes will loot a lost temple in the forests of Bolivia, go head-to-head with the Mafia in New York City, face a deadly epidemic in the jungles of North...

"Call of Cthulhu is a tabletop roleplaying game based upon the worlds of H. P. Lovecraft. It is a game of secrets, mysteries, and horror. Playing the role of steadfast investigators, you travel to strange and dangerous places, uncover foul plots, and stand against the terrors of the Cthulhu Mythos ...This book, the Keeper Rulebook, contains the core rules, background, guidance, spells, and monsters of the game. It is intended for use by the Keeper...