Innsmouth’s Secrets Uncovered
Innsmouth is the definitive guide to the rotting seaport town—one of the most iconic settings for Call of Cthulhu.

Once a thriving seaport on the Massachusetts coast during the 19th century, a dark shadow has fallen over Innsmouth—Some say old Captain Obed Marsh made a pact with the Devil, while others tell stranger and more wicked tales.
What's Inside?

In the early 1920s, the town’s former glories are long forgotten, and wise folk keep away. Secrets have a currency in Innsmouth, and the unwary pay a high price for asking the wrong questions.

A Sandbox Campaign Setting

An essential resource for Innsmouth-based scenarios as well as campaigns within the wider Arkham and Miskatonic Valley region. Description, insights, and plot seeds from over 100 Innsmouth locations in and around the town.

Secrets to Uncover

Call of Cthulhu: Innsmouth includes street maps in player and Keeper versions, as well as floorplans for key locations, gossip and rumors to spark further mysteries and adventure. The book also covers the secrets, intrigues, and profiles for more than 80 characters and encounters.

The Dreaded Order of Dagon

The book details the full secret history of Innsmouth, its unseen masters, and specifics about the mysterious Esoteric Order of Dagon. You’ll also find extensive information about the Dagon cult, and the horrid Deep Ones—with entirely new and horrifying aspects.

For Mature Readers: contains mature themes and is intended for mature players.
This supplement is part of the Arkham Unveiled line and is designed for use with both the Call of Cthulhu roleplaying game and, optionally, the Pulp Cthulhu supplement, both available separately.
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What The Critics Say
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“The most comprehensive resource ever published for Call of Cthulhu's most famous fictional town… [Call of Cthulhu] seventh edition has maintained a strong publication pace since its 2014 launch, and Innsmouth sits alongside the Arkham sourcebook as one of its most structurally ambitious location supplements in the line.””
— Tech Times, Call of Cthulhu Finally Gets Dedicated Innsmouth Hardcover.
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“The book does an absolutely incredible job of creating a fully realized sandbox for players to explore. The amount of lore and locations packed inside is enough to run a campaign for years, with writing that’s both evocative and informational…T he end result is an absolute classic Call of Cthulhu RPG supplement. Whether you’re a returning visitor to Innsmouth or a landlubber looking for your first taste of fish and fear, this is one book worth getting your hooks into. 19/20”
— TTRPG Fanatics, Call of Cthulhu: Innsmouth (Review and Deep Dive).
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"A fantastic resource."
— Nick Olivo, Reviewing Innsmouth.
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"“More than delivers… Without a doubt, a book that would look right at home on any Keeper’s shelf, or any Lovecraft fan’s.”"
— collectible506.com, Review: Arkham Unveiled – Innsmouth.
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"This is a book that transcends the role-playing game itself. These pages will be useful to anyone who wants to set their games or campaigns in Innsmouth, regardless of the game they use. Even if you're not going to be the game master, if you're a fan of the Deep Ones or Dagon and Hydra , you'll find hours of captivating reading here…"
— Tristan Oberon, Arkham Unveiled: Innsmouth.
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“Crammed full of useful info sure to inspire plenty of adventuring in the classic Lovecraft sea port. I absolutely love how there are many different options on how to approach including Innsmouth in your adventures and campaigns and what exactly is the relationship with the town and the Deep Ones. This is an absolute must own… 10/10”
— The Gaming Gang, Call of Cthulhu: Innsmouth Reviewed.
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“If your Keeper has ever waved vaguely at Innsmouth and said ‘you get a bad feeling about this place’, that excuse has just expired. Chaosium has released Call of Cthulhu: Innsmouth, a 272-page hardcover that maps Lovecraft's rotting Massachusetts seaport street by street and hands Keepers the keys to every locked door in it.”
— Backseat Gamer, Call of Cthulhu: Innsmouth Maps the Whole Rotting Town.
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“An absolute must own.. on a scale of 0 to 10, I give Call of Cthulhu: Innsmouth a from Chaosium Inc. the rarified 10 out of 10.”
— The Gaming Gang, Call of Cthulhu: Innsmouth Reviewed.
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PDF Product Name: [Call of Cthulhu: Innsmouth - PDF]
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Product Footer
Footer Name:
- Publisher:
- Chaosium
- Ruleset:
- 7th Edition Call of Cthulhu
- Year Released:
- 2026
- Format:
- Full Color Leatherette
- Page Count:
- 272
- ISBN:
- 978-1-56882-586-1
- Authors:
- Mike Mason, Sean Branney, Andrew Leman, Kevin Ross, Keith Herber
- Cover Artist:
- Loïc Muzy
- Interior Artists:
- David Ardila, Ruth Bosch, Nick Grey, Erik Davis-Helm, Lin Hsiang, Pat Loboyko, Samuel Marcelino, David Metzger, Wayne Miller, Erling Saevarsson, Nicola Silvani, John Sumrow, Yuchen Wang
- Layout:
- Adam Szelążek, Chandler Kennedy
- Cartography and Handouts:
- Matt Ryan and John Malcom














