A dire plan has been enacted. If allowed to come to fruition, it threatens to destroy humanity as we know it. But all is not lost. If a few brave souls can uncover and piece together certain information, they might stand against the darkness and prevent the unspeakable from happening. Facing dark cults, strange lore, hideous monsters, and a host of implacable foes, the investigators embark on a journey of discovery to face the ultimate horror. This is their story and yours to tell. Slipcase set including two hardcover books and handouts pack. Masks of Nyarlathotep has been comprehensively revised and updated for use with Call of Cthulhu 7th Edition, but may also be run with the Pulp Cthulhu supplement. Requires the Call of Cthulhu Keeper`s Rulebook (7th edition) to play, and is optionally usable with Pulp Cthulhu.