CALL OF CTHULHU ROLEPLAYING] "Shadows of Yog-Sothoth" is a modestly-sized campaign of seven scenarios. During the course of play the investigators penetrate the outer layers of a secret sinister occult organization led by the lords of the Silver Twilight. Beginning in Boston they investigate an organization in New York, run afoul of a coven in Scotland, roam the desert of the American southwest, vacation off the coast of Maine, and explore the mysteries of the South Pacific.