Cthulhu Britannica London: A Look inside the Keeper’s Guide

Cthulhu Britannica: London is our deluxe boxed set for Call of Cthulhu, the ultimate supplement for running games set in 1920s London. The PDF version is now available to buy, and the pre-order for the physical boxed set is open too. Pre-orders at both our webstore and at participating Bits & Mortar retailers come with a complementary PDF copy too.

From dark cults masquerading as social clubs and occult bookshops on Charing Cross Road to ghouls in the Underground to Queen Rat’s domain in the sewers, there’s much hidden within London. The second of three books in the boxed set, The Keeper’s Guide to London delves into these mysteries and more besides, offering invaluable advice to a Keeper wishing to set his Call of Cthulhu game within our nation’s fair capital.

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The Keeper’s Guide to London is, as the name suggests, strictly for the Keeper’s eyes only! It’s jammed full of ideas for running Call of Cthulhu adventures set in London, starting with a chapter devoted to bringing Mythos London to life. This chapter discusses at length how you might go about running a scenario or campaign set in London, discussing both the real and Mythos threats to the capital, plots to inspire your own games and some of the themes and motifs you can use to bring the city – and the horror – to life.

Complementing the history presented in The Investigator’s Guide to London, The Keeper’s Guide presents a history of the occult in London, including unusual and Fortean events that occurred throughout the 1920s. Did you know that in 1920 six amnesiacs were found wandering the streets, or that in 1922 the Metropolitan police engaged the services of a professional vampire-hunter to deal with a series of attacks that bore the hallmark of the undead?

A series of unusual locations and occult organisations (all real) are detailed, providing the Keeper with plenty of ready-made adventure material, as well as a selection of potential allies and associates that a Keeper can drop into the game at a moment’s notice.

The final third of the book is devoted to a selection of ready-made (and fictional – we hope!) Mythos threats to London, from the Brothers of the Dragon to the Lesser Powers of London. There’s also an entire secret society – the Society of London for the Exploration and Development of the Esoteric Sciences – that can provide the focus for an entire campaign, either as allies or enemies. The book is rounded off by a selection of new Mythos tomes and books, including a section about the occult books of Dr John Dee, who was the (real-world) astrologer and court magician of Queen Elizabeth I.

As you’ll find out tomorrow when we talk about the third book, Adventures in Mythos London, Dr Dee is a recurring character in our boxed set.

About Cthulhu Britannica: London


London in the 1920s is the greatest city in the world, a vibrant melting pot of history and culture at the heart of the British Empire. But underneath the powerhouse of the City lie millennia of history, from the well-documented paths of Roman Londinium to darker antediluvian secrets veiled from modern eyes. London sits atop its history: an ancient swampland that was itself once an even-more-ancient sea-bed. Who knows what secrets lie buried?

The Cthulhu Britannica: London boxed set is the ultimate guide to running games of Call of Cthulhu set in London. The PDF version is available now. We're also taking pre-orders for the physical edition of the boxed set too at our webstore.


Find out more about Cthulhu Britannica here.
Cthulhu Britannica: London Preorder + PDF
Buy the Cthulhu Britannica: London PDF at RPGNow


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