The Immeasurable Heaven by Caspar Geon (3rd August 2026)

The Race for Reality Has Begun.

The galaxy of Yokkun’s Depth has been settled since time immemorial. There is only one frontier left, and it’s a one-way journey: to pierce the skin of existence and delve the countless younger universes beneath.

Running through these universes is the fabled Well, a fissure formed in the distant past into which horrors have been flung for millions of years. Amongst their number was an impossibly ancient sorcerer, cast down to the wastelands of a thousand apocalyptic worlds, never to return.

Until now.

Whirazomar is crossing the stars in the belly of a sentient spore, hoping she can make it to the Well before her masters’ rivals realise what she’s hunting: somewhere far below them, a hapless explorer has drafted a map of reality. A map that the exile is sure to seek out. A map so valuable that a kaleidoscope of beings will run the gauntlet of every universe to get it, even at the cost of their lives.

Caspar Geon has worked for a number of years as an extragalactic philologist, painstakingly compiling The Immeasurable Heaven with assistance from voices in his head. He lives in a ramshackle house in the West Country, and spends his days chuckling at his own jokes.

“A wordsmith without peer… (a) startling, unpredictable and croggling freshness of imagery and action, Geon/Toner’s new book is like the treasures of a thousand thousand phaslairs.” —Locus

“An absolutely wild ride through a formidably original universe, filled with the bizarre and phantasmagorical.” —Adrian Tchaikovsky

“Fearlessly creative, wildly imaginative, and wholly satisfying.” — Gareth L Powell

“Wildly, explosively imaginative, The Immeasurable Heaven is a feast of a book: among the most original science fiction I’ve read in years.” —Stark Holborn

“The intrigue, character, humour, plot, world building, and sheer breadth of imagination, makes The Immeasurable Heaven a truly exceptional piece of Sci-Fi. The best and most original book I’ve read in years” —Ed Cox

“If you’re the sort of person who likes to have your brain bent in the best possible way, you really need to give this a read. This book is a wild ride, and I promise you won’t regret it.” —Ed Ashton, author of Mickey7

“Escape from mundane reality to this slice of epic, bold, multiversal, sci-fi heaven.” —Eeleen Lee

“One of the widest canvases I’ve ever read in an SFF novel… An experience like few others, in a setting completely alien to our own.” —Nerds of a Feather

“You’re not ready for this book. The Immeasurable Heaven is a stunning ode to the weirdness living inside us that’s just waiting to be discovered, one layer at a time. To say this book is inventive is like saying the Mona Lisa is a portrait. It’s true, but it doesn’t really scratch the surface. Caspar Geon has thrown restraint out of the window. There’s more imagination in some of the sentences of this novel than there are in entire books.” – FanFiAddict

“An endlessly enjoyable read, up there with Jack L. Chalker’s Well World series and Robert Silverberg’s Son of Man.” —C. M. Kosemen, author of All Tomorrows