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Shadows of Yog-Sothoth PDF

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A Global Call of Cthulhu Campaign to Save Mankind

The Silver Twilight is a secretive, international order dedicated to the destruction of the human race. As brave investigators, you must piece together passages from esoteric books, shards of strange artifacts, and puzzling letters to discover the Silver Twilight’s loathsome goals.

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.

In addition to the campaign, this book includes two bonus scenarios. The People of the Monolith introduces the mysteries of the Cthulhu Mythos, and no harm can come to the investigators except through insanity. As such, is perfect for introducing new players to the wonders of Call of Cthulhu.

The other bonus scenario, The Warren, presents an unsettling challenge for even experienced players.


  • The Hermetic Order of the Silver Twilight
  • Look to the Future
  • The Coven of Cannich
  • Devil’s Canyon
  • The Worm that Walks
  • The Watchers of Easter Island
  • The Rise of R’lyeh


  • The People of the Monolith
  • The Warren


What The Critics Say

  • "To this day, whenever I think of refereeing Call of Cthulhu, I find myself thinking back to Sandy Petersen's masterpiece. It's exceptionally well done, with lots of variety in its sanity-shattering horrors and the overall structure."

    — Grognardia, My Top 9 non-D&D Adventures of All Time.

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3rd Edition Call of Cthulhu
Black & White PDF
Page Count:
Sandy Petersen
Cover Artist:
Tom Sullivan
  • Full Star Full Star Full Star Full Star Empty Star 4
    A Flawed Gem

    Posted by Matthew A. on 1st Dec 2021

    Our gaming group just finished running this entire campaign over a period of about ten months (meeting every other Saturday evening), with myself as the Keeper. Shadows of Yog-Sothoth is Call of Cthulhu's first full-length campaign and one of its first supplements. The book is full of great ideas and some excellent situations but, as has been noted by many, the original text requires a good deal of revision on the Keeper's part to become fully playable. Both the 2nd and 6th edition versions are more of a draft than a fleshed-out collection of scenarios; expect both to improvise and rewrite extensively as the Keeper.