Mystery & Horror in the Victorian Age
Dark Shadows in the 1890s
Unleash the horrors of the Victorian night, reveal sinister secrets, forbidden lore, and mysteries of the late 19th century at your gaming table.
What's Inside
Cthulhu by Gaslight takes the Call of Cthulhu roleplaying game to the fog-shrouded streets of Great Britain and beyond. This book is designed for Keepers—those who will be running the game.
A World by Gaslight

Extensive advice for bringing the 1890s setting to life, including the Gazetteer of Fear—over 100 locations across Britain and beyond! The book also includes detailed information on villainous organizations and occult societies such as the Secrets of the Hermetic Order of the Golden Dawn.
Gaslight Mechanics

The Cthulhu by Gaslight: Keeper’s Guide includes rules for Monsters and Mythos elements unique to 1890s Britain. Inside, you’ll also find new occult-based skills, tomes, spells, and rules for combat upon the astral plane!
A Complete Experience

Cthulhu by Gaslight is a stand-alone version of Call of Cthulhu. Only the core Cthulhu by Gaslight: Investigator’s Guide and Cthulhu by Gaslight: Keeper’s Guide are required to play!
Scenarios
In addition to many scenario seeds to help spark all-new Cthulhu by Gaslight stories of your own design, the book includes two introductory scenarios, both designed for players new to the setting.

The Forby Masterwork
During the summer of 1890, the investigators are drawn into a mystery surrounding a cursed family, and must seek out a lost gem and uncover the truth behind multiple haunted sites.

Oranges & Lemons
In the heart of London’s Victorian slums, a gruesome death sees the investigators potentially infected with disease. As they explore events surrounding the death, they will uncover something lurking beneath London.
What The Critics Say
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“A terrific sourcebook, brimming with useful information about the Victorian era, plus it has two great scenarios.”
— Sean Branney, H.P. Lovecraft Historical Society, Gaslight Keeper's Guide Review.
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“Seth and Jon agree, this is a "must have" book for any group looking to play Call of Cthulhu in London's fog-shrouded Victorian period.”
— Modern Mythos Podcast, Cthulhu by Gaslight: Keeper's Guide.
Downloads for this Product
- Publisher:
- Chaosium
- Year Released:
- 2025
- Page Count:
- 266
- Format:
- Full Color Leatherette
- Ruleset:
- Cthulhu 7th Edition
- ISBN:
- 978-1-56882-534-2
- Authors:
- Keris McDonald, Mike Mason, Penelope Love, Mike Lay, Lynne Hardy, David Wade, Garrie Hall, James Coquillat, William A. Barton, Kevin Ross
- Leatherette Cover Design:
- Monika Godyń
- Layout:
- Chandler Kennedy
- Cover Art:
- Loïc Muzy
- Interior Art:
- Bloom Báirseach, John Barry Ballaran, Franz Michael A. Bautista, Tom Brown, János Brumár, JB Casacop, Erik Davis-Heim, Gabriel Fecury, Andoni Fernández, Doruk Golcu, Chris Huth, Heikki Korhonen, Nikoloz Kuparadze, Pat Loboyko, Luke Marcatili
- Interior Art (Continued):
- Louie Maryon, Joshua Meehan, Gretchen Meinzen, Wayne Miller, Alice Morelli, Miriam Moritz, Lachlan Page, Kelsey Phillips, Nathaniel Pilgrim, Nicola Silvani, and Tophecake