Sherlock Holmes Cthulhu Fiction

What happens when Sherlock Holmes heads to Lovecraftian New England? What happens when Cthulhu makes an appearance in Victiorian Old England? This is a scenario that many authors have tried their hands at, possibly beginning with Neil Gamain's modern day classic A Study In Emerald, which one the Hugo Award in 2004 for Best Short Story. This story has been adapted to Board Games, a Graphic Novel, and more. It's available for free on Neil Gaiman's website, in a beautiful pdf, formatted to resemble a newsletter from 1914 (it even has fake advertisements).

In recent years, two trilogies from different authors have appeared, crossing over Holmes and Lovecraft, so there seems to be an increase in interest in such crossovers.

What follows is a detailed list of all known examples of Holmes/Lovecraft crossovers.

I warned you all that I like lists, so here's another one. As always, if you see something incorrect, or know of something missing, please let me know and I will do the appropriate research, and correct as necessary. hanwds at, possibly beginning with Neil Gamain's modern day classic


Shadows Over Baker Street (2003) by Michael Reaves and John Pelan (ed.)

Shadows Over Baker Street


"Sir Arthur Conan Doyle’s Sherlock Holmes is among the most famous literary figures of all time. For more than a hundred years, his adventures have stood as imperishable monuments to the ability of human reason to penetrate every mystery, solve every puzzle, and punish every crime.

For nearly as long, the macabre tales of H. P. Lovecraft have haunted readers with their nightmarish glimpses into realms of cosmic chaos and undying evil. But what would happen if Conan Doyle’s peerless detective and his allies were to find themselves faced with mysteries whose solutions lay not only beyond the grasp of logic, but of sanity itself.

In this collection of all-new, all-original tales, twenty of today’s most cutting edge writers provide their answers to that burning question.

“A Study in Emerald” by Neil Gaiman: A gruesome murder exposes a plot against the Crown, a seditious conspiracy so cunningly wrought that only one man in all London could have planned it–and only one man can hope to stop it.

“A Case of Royal Blood” by Steven-Elliot Altman: Sherlock Holmes and H. G. Wells join forces to protect a princess stalked by a ghost–or perhaps something far worse than a ghost.

“Art in the Blood” by Brian Stableford: One man’s horrific affliction leads Sherlock Holmes to an ancient curse that threatens to awaken the crawling chaos slumbering in the blood of all humankind.

“The Curious Case of Miss Violet Stone” by Poppy Z. Brite and David Ferguson: A girl who has not eaten in more than three years teaches Holmes and Watson that sometimes the impossible cannot be eliminated.

“The Horror of the Many Faces” by Tim Lebbon: Dr. Watson witnesses a maniacal murder in London–and recognizes the villain as none other than his friend, Mr. Sherlock Holmes.

With these and fourteen other dark tales of madness, horror, and deduction, a new and terrible game is afoot.

The terrifyingly surreal universe of horror master H. P. Lovecraft bleeds into the logical world of Sherlock Holmes, Sir Arthur Conan Doyle’s champion of rational deduction–in these brand-new stories by twenty of today’s top horror, mystery, fantasy, and science fiction writers, including:

• Steven-Elliot Altman • Elizabeth Bear • Poppy Z. Brite • Simon Clark • David Ferguson • Paul Finch • Neil Gaiman • Barbara Hambly • Caitlin R. Kiernan • Tim Lebbon • James Lowder • Richard A. Lupoff • F. Gwynplaine McIntyre • John Pelan • Steve Perry • Michael Reaves • Brian Stableford • John P. Vourlis • David Niall Wilson & Patricia Lee Macomber"

Shadows Over Baker Street is currently Out of Print, however, it is available on Kindle, as well as used copies available on Amazon.


Sherlock Holmes: Cthulhu Mythos Adventures (2015) by Ralph E. Vaughan

Sherlock Holmes: Cthulhu Mythos Adventures


"Beyond Baker Street is a shadowy realm where cultists worship Earth’s past masters, the gods of the Cthulhu Mythos. Sherlock Holmes has seen beyond reality’s veneer and applied his keen analytical mind to the nightmare logic that drives ordinary men insane. When followers of evil try to free their monstrous masters, they find Sherlock Holmes ready to confront them."

Sherlock Holmes: Cthulhu Mythos Adventures is available in Paperback and Kindle



The Cthulhu Casebooks: Sherlock Holmes and the Shadwell Shadows (2016) by James Lovegrove

The Cthulhu Casebooks: Sherlock Holmes and the Shadwell Shadows


"It is the autumn of 1880, and Dr John Watson has just returned from Afghanistan. Badly injured and desperate to forget a nightmarish expedition that left him doubting his sanity, Watson is close to destitution when he meets the extraordinary Sherlock Holmes, who is investigating a series of deaths in the Shadwell district of London. Several bodies have been found, the victims appearing to have starved to death over the course of several weeks, and yet they were reported alive and well mere days before. Moreover, there are disturbing reports of creeping shadows that inspire dread in any who stray too close. Holmes deduces a connection between the deaths and a sinister drug lord who is seeking to expand his criminal empire. Yet both he and Watson are soon forced to accept that there are forces at work far more powerful than they could ever have imagined. Forces that can be summoned, if one is brave – or mad – enough to dare… "

Sherlock Holmes and the Shadwell Shadows is available in Hardcover, Paperback, and Kindle


The Cthulhu Casebooks: Sherlock Holmes and the Miskatonic Monstrosities (2017) by James Lovegrove

The Cthulhu Casebooks: Sherlock Holmes and the Miskatonic Monstrosities


"It is the spring of 1895, and more than a decade of combating eldritch entities has cost Dr John Watson his beloved wife Mary, and nearly broken the health of Sherlock Holmes. Yet the companions do not hesitate when they are called to the infamous Bedlam lunatic asylum, where they find an inmate speaking in R'lyehian, the language of the Old Ones. Moreover, the man is horribly scarred and has no memory of who he is.

The detectives discover that the inmate was once a scientist, a student of Miskatonic University, and one of two survivors of a doomed voyage down the Miskatonic River to capture the semi-mythical shoggoth. Yet how has he ended up in London, without his wits? And when the man is taken from Bedlam by forces beyond normal mortal comprehension, it becomes clear that there is far more to the case than one disturbed Bostonian. It is only by learning what truly happened on that fateful New England voyage that Holmes and Watson will uncover the truth, and learn who is behind the Miskatonic monstrosity..."

Sherlock Holmes and the Miskatonic Monstrosties is available in Hardcover, Paperback, and Kindle


The Cthulhu Casebooks: Sherlock Holmes and the Sussex Sea-Devils (2018) by James Lovegrove

The Cthulhu Casebooks: Sherlock Holmes and the Sussex Sea-Devils


"It is the autumn of 1910, and for fifteen long years Sherlock Holmes and Dr John Watson have battled R'lluhloig, the Hidden Mind that was once Professor James Moriarty. Europe is creeping inexorably towards war, and a more cosmic conflict is nearing its zenith, as in a single night all the most eminent members of the Diogenes Club die horribly, seemingly by their own hands. Holmes suspects it is the handiwork of a German spy working for R'lluhloig, but his search for vengeance costs an old friend his life.

The companions retreat to Holmes's farm on the Sussex Downs, and it is not long before a client comes calling. Three young women have disappeared from the nearby town of Newford, and the locals have no doubt who is responsible. For legend has it that strange amphibious creatures dwell in a city on the seabed, coming ashore every few centuries to take fresh captives. As Holmes and Watson seek out the terrifying interlopers, the scene is set for the final battle that will bring them face to face with the Sussex Sea-Devils, and perhaps with Cthulhu himself..."

Sherlock Holmes and the Sussex Sea-Devils is available in Hardcover, and Kindle, with a pre-order currently for the Paperback.


Sherlock Holmes vs. Cthulhu: The Adventure of the Deadly Dimension (2017) by Lois H. Gresh