Shadows of Yog-Sothoth – A Global Campaign to Save Mankind, softback campaign for Call of Cthulhu 1920s, by Sandy Petersen
“The rise of forgotten R’lyeh
Cthulhu sleeps in the corpse city of R’lyeh. Through unblinking eyes he watches mountains grow and empires rise and fall. He lays quiet, unmoving. Now he stirs. He senses that the stars are once again converging into their proper formations. His worshippers have plotted for the day when their mighty lord once again walks the earth. That day has come!
Shadows of Yog-Sothoth presents a grand, seven-part campaign, revealing details of the Silver Twilight, an organization dedicated to forcing the premature rise of R’lyeh and the release of dread Cthulhu.”