Adventure, Mystery, & Horror in the 1890s
What's Inside
Cthulhu by Gaslight takes the Call of Cthulhu roleplaying game to the fog-shrouded streets of Great Britain and beyond.
A New Setting
The 1880s—Victorian England. Mystery and adventure in fog-shrouded streets and alleyways. Secret cabals commit grisly murder, wicked crimes, and pledge to bring about the ruin of civilization—all within the square mile of the City of London.
The Complete Rules
Cthulhu by Gaslight is a stand-alone game, and contains the complete rules for the Call of Cthulhu roleplaying game, including character creation. You do not need a copy of the Call of Cthulhu: Keeper Rulebook or Call of Cthulhu: Starter Set to play. The Cthulhu by Gaslight: Investigators’ Guide can be enhanced with the Call of Cthulhu roleplaying game as well as the Pulp Cthulhu supplement, both available separately.
Everything You Need
A complete list of weapons and equipment appropriate for the Gaslight-period. Rules for exploring in the 1890s, and extensive information on Fringe Science and the Occult practices of the time. The book also includes 10 pre-generated Cthulhu by Gaslight Investigators.
Downloads for this Product
What The Critics Say
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“The new Gaslight supplement is a beautiful book, filled with exhaustive research that's fully applicable to playing Call of Cthulhu in this setting… I love how they've expanded the game to involve characters from all classes of society; games can be like Dickens novels! Good show, Chaosium, good show!”
— Sean Branney, H.P. Lovecraft Historical Society.
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“Masterful… a must have.”
— Susurros desde la Oscuridad, Cthulhu by Gaslight Investigator's Guide.
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“One of my favorite settings is the Gaslight era (late 1800’s), which puts the Cthulhu Mythos in the same time as Jack the Ripper. Cthulhu by Gaslight Investigator’s Guide is basically the 7E based rules for running the game including character creation, skill use, setting background, combat and more… an absolutely fantastic book.”
— EuroCultAV, EuroCultAV Holiday Gift Guide 2024.
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“Cthulhu by Gaslight is a robust product, and players will be spoiled with new material if they want to take on the 19th-century Lovecraftian horrors.”
— The British Fantasy Society, Cthulhu by Gaslight: Investigators’ Guide by Barton, Hardy, Mason, McDonald, Ross and Wade.
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“In turns interesting and informative, packed with details and interesting facts, many of which will both intrigue the most ardent devotee of the history of the period and help bring the setting to life when brought into play.”
— Reviews from R’lyeh, https://rlyehreviews.blogspot.com/2025/02/mauve-madness.html.
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“Lots of games have touched on the period, but few have managed it to the level of detail and clarity offered here.”
— Refereeing and Reflection, A Victorian Antique Restored: Cthulhu By Gaslight Investigators’ Guide.
- Publisher:
- Chaosium
- Year Released:
- 2024
- Ruleset:
- 7th Edition Call of Cthulhu
- Page Count:
- 296
- Format:
- Full Color Hardcover
- ISBN:
- 978-1-56882-494-9
- Authors:
- Keris McDonald and Mike Mason
- Additional Authors:
- William A. Barton and Kevin Ross, David Wade, Lynne Hardy, Russell A. Smith, Violet Fenn, Rodney Basler, VJ Kopacki, Garrie Hall, and Jason Bell
- Cover Artist:
- Loïc Muzy
- Interior Artists:
- Hannah Elizabeth Baker, Bloom Báirseach, Alberto Bontempi, Tom Brown, Yannis Cardin, JB Casacop, Caleb Cleveland, Alice Duke, Chris Huth
- Interior Artists (2):
- Bethan Jones, Symon Leech, Louie Maryon, Joshua Meehan, Sarah Miller, Wayne Miller, Lachlan Page, Riley Spalding, John Sumrow
- Cartography:
- Alyssa Faden and Matt Ryan
- Layout:
- Chandler Kennedy
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Cthulhu by Gaslight Review
If you love Call of Cthulhu and the gothic atmosphere of Victorian England, Cthulhu by Gaslight is a must-have. Updated for 7th Edition, this Player’s Guide blends historical intrigue with cosmic horror, offering an immersive setting filled with fog-drenched streets and aristocratic drawing rooms. The book excels in accessibility, featuring a self-contained system that’s easy for both newcomers and seasoned players, while maintaining Chaosium’s signature high production quality. While it doesn’t reinvent the Mythos or introduce groundbreaking mechanics, it delivers a faithful and richly detailed experience that fans of historical horror will appreciate. Final Verdict: B+ – a strong addition to any Call of Cthulhu collection. ? Read the full review here: https://www.devilsadvocatestudios.com/cthulhu-by-gaslight
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A great guide
As with all the 7th Ed books that are coming out this one is choke full of great content for games of the period and I love reading the history. As an American keeper this gives a lot of background for future Gaslight games, really looking forward to the Keepers Guide in the near future!
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Hallelujah! Finally!
After many years of begging, pleading, and ritual sacrifice Chaosium finally delivers! It’s extremely well written, and a must have for all would be Gaslight Keepers and Investigators. Well done Chaosium!!
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PDF Included with Purchase
If you add this product to your cart, the product Cthulhu by Gaslight: Investigators' Guide - PDF will automatically be added to your shopping cart and you will receive it for free.
