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In Strange Seas: Horror in the Royal Navy for Regency CthulhuClick to magnify
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In Strange Seas: Horror in the Royal Navy for Regency Cthulhu


The Royal Navy meets the Mythos!

In the Regency Era, the Royal Navy is all that stands between England and the imperial designs of Napoleon. Now, the sailors must also stand against the horrors of threats beyond all understanding!

Can your investigators survive in the dangerous wooden world of a King’s ship? And if they do, will their reputations survive intact?

What Do You Get?

In Strange Seas provides a full 30-page setting guide for the world of the Royal Navy in Regency Cthulhu. In this guide, you get:

  • Details about society and daily life at sea
  • Tips for running naval combat, with a player-facing cheat sheet!
  • Customized investigator creation, including Navy-specific occupations and backstory tables 
  • Advice on using Reputation rules at sea, where a sailor may be poor in treasure but rich in esteem
  • Quick references for all different kinds of ships
  • A tour of a frigate
  • Colorful phrases, and
  • Period-authentic recipes!

Wonders in the Deep: When you buy In Strange Seas, you also get an introductory scenario, "Wonders in the Deep."

Brave British sailors carry on a secret war against Napoleon's mythos sorcerers! Can you and your shipmates survive this chilling encounter without losing your lives, your sanity - and most importantly, your reputation?" CW: Gore, warfare

The Gazette: You also get access to "The Gazette," a living-world document full of the ships, NPCs, plot hooks, and mythos entities populating the wider world of In Strange Seas. And if you buy this guide as part of the In Strange Seas Bundle, you receive several additional scenarios for more Royal Navy horror set on both land and sea!

The Scenario Bundle is Now Available!

Want to dive into the wide world of In Strange Seas? Get a bundle that includes this setting guide, plus Wonders in the Deep, PLUS several additional scenarios, for a discounted price!

The scenarios are by authors such as SR Sellens, Alexander Smith, Stephen & Carolyn Stein, and Cameron Hays!

Find the bundle HERE. 

"Mentioned in Dispatches": Praise for In Strange Seas!

As of May 14, 2023, the bundle has been chosen as the 5d Pop Culture Website Pick of the Week! We are thrilled and grateful.

On May 15, 2023, the In Strange Seas setting guide was featured in Chaosium's "Miskatonic Monday" newsletter! We appreciate the Admiralty's attention.

Watch an Actual Play of this scenario on the Symphony Entertainment twitch stream! 

Recording available on Youtube HERE.

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Reviews (2)
Discussions (1)
Customer avatar
August 24, 2023 5:28 am UTC
Does this require the Regency Cthulhu rulebook, or can it be run with the basic Call of Cthulhu rules?
Customer avatar
Evan P August 24, 2023 10:55 am UTC
Thanks for asking! You can certainly run this with basic Call of Cthulhu.

What the Regency book gives you are some new skills, like Etiquette and Reputation, that get a lot of play in In Strange Seas, but you can figure out what they are and how to use them from context.

The Regency book also gives you lots of setting material for upper-class daily life by land, which may or may not be useful to you in your Naval adventures.

I hope you enjoy it!
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File Last Updated:
April 25, 2023
This title was added to our catalog on May 09, 2023.