Arkham Horror: The Last Ritual by S A Sidor

The Last Ritual

An Arkham Horror Novel

The Last Ritual

An Arkham Horror Novel

By S A Sidor

A mad surrealist’s art threatens to rip open the fabric of reality, in this twisted tale of eldritch horror and conspiracy, from the wildly popular world of Arkham Horror.

Aspiring painter Alden Oakes is invited to join a mysterious art commune in Arkham: the New Colony. When celebrated Spanish surrealist Juan Hugo Balthazarr visits the colony, Alden and the other artists quickly fall under his charismatic spell. Balthazarr throws a string of decadent parties for Arkham’s social elite, conjuring arcane illusions which blur the boundaries between nightmare and reality. Only slowly does Alden come to suspect that Balthazarr’s mock rituals are intended to break through those walls and free what lies beyond. Alden must act, but it might already be too late to save himself, let alone Arkham.

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Arkham Horror

Arkham Horror

It is the height of the Roaring Twenties – a fresh enthusiasm for the arts, science, and exploration of the past have opened doors to a wider world, and beyond… And yet, a dark shadow grows in the city of Arkham. Alien entities known as Ancient Ones lurk in the emptiness beyond space and time, writhing at the thresholds between worlds. Eldritch rituals must be stopped and alien creatures destroyed; before the Ancient Ones make our world their ruined dominion. Only a handful of investigators stand against the horrors threatening to tear this world apart. Will they prevail?

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Publication Details

Page Count: 352pp
Cover Art: John Coulthart
Genre: Fantasy

Paperback edition

US On Sale Date: November 3, 2020
UK On Sale Date: January 21, 2021
Paperback ISBN: 9781839080135
Paperback Dimensions: 197mm x 130mm

Ebook edition

Global Ebook On Sale Date: November 3, 2020
ebook ISBN: 9781839080142


Global On Sale: December 21, 2021
ISBN: 9781666190489

GraphicAudio Drama

Global On Sale: July 13, 2022
ISBN: 9798212331487

About the Author

S A SIDOR is the author of four dark crime thrillers and more recently two splendid supernatural-pulp adventures, Fury From the Tomb and The Beast of Nightfall Lodge. He lives near Chicago with his family.

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In Translation


Das Letzte Ritual  – order now
  Published by Cross Cult
  Paperback On Sale: August 2, 2021


The Last Ritual
  Published by Asmodee Italia
  Coming Soon

Interviews and Articles

“I want readers to feel something. If a reader wonders if they’ve walked into a haunted, surreal painting, then I’ve gotten things right.”
Track of Words, Interview with S A Sidor, author of The Last Ritual


“Superbly written, deftly plotted, and imbued with Sidor’s absolutely phenomenal imagination and inherent understanding of the decaying, sumptuous décor of Jazz Age Arkham that hides a terrifying underside, The Last Ritual is one of the most enjoyable and memorable occult horror thrillers that I have read in a long time.”
SciFi and Fantasy Reviewer

“This would make a wonderful TV serial, akin to the recent Lovecraft Country. I enjoyed my time in this strange land immensely, and am looking forward very much to the next titles in the series. Absolutely recommended.”
The Catbox

“What a beautifully-crafted piece of work The Last Ritual is, in all senses… provides a fascinating window into Eldritch activities that grow from unsettling to truly horrifying.”
Fistful of Meeples

The Last Ritual is a brilliantly eerie and well executed read.”
Book Vagabond

“Creepy entertainment for less beautiful autumn days.”
Rosa Couch

“As unsettling and disturbing as anything that Lovecraft himself wrote… a complex, gripping roller coaster ride.”
Amazing Stories

“Whether this is your first introduction to the world of Arkham Horror or you’re a long time fan I’m sure that The Last Ritual will keep you hooked right up to the end.”

The Last Ritual by S A Sidor is a perfect tie-in novel for the Arkham Horror universe… a fantastic yarn.”
Jeremiah Dylan Cook, Horror And Fantasy Writer

“A master of the unsettling, and each twist is more grisly and unexpected than the last.”
– Publishers Weekly starred review

“Sidor is a prince of darkness, steeped in the noir tradition and not giving an inch. That said, he is also bountifully talented.”
– Kirkus Reviews

“A master of the unsettling, and each twist is more grisly and unexpected than the last.”
Publishers Weekly starred review

Arkham Horror: The Last Ritual by S A Sidor

Global Ebook On Sale: November 3, 2020
US Paperback On Sale: November 3, 2020
UK Paperback On Sale: January 21, 2021
Global Audiobook On Sale: December 21, 2021 GraphicAudio Drama On Sale: July 13, 2022

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Arkham Horror: The Last Ritual by S A Sidor