
Summary
A debut sci-fi mystery set on an abandoned future Earth, featuring a twisty mystery straight out of a John le Carré novel, a group of larger-than-life characters who’d be at home in the work of John Scalzi, and a deeply weird and dangerous hyperdimensional entity to haunt the dreams of any reader of Kim Stanley Robinson.
Humanity is dying. Banished from the Earth, our descendants eke out lives in orbital habitats and moon colonies––and look with longing on our former home.
But…
Book Details
| ISBN-13: | 9798895150528 |
|---|---|
| Author: | Colin Brush |
| Publisher: | Diversion Books |
| Imprint: | Diversion Books |
| Format: | Paperback |
| Number of Pages: | 352 |
| Release Date: | 1 January 2026 |
| Weight: | 430g |
| Dimensions: | 30mm x 152mm x 229mm |

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Critics Review
“Brush explores whether humanity should cling to its old home or seek a new life among the stars in this novel about a uniquely imagined dystopia… . Dual timelines, a shockingly hyperdimensional setting, and flawed characters make this a must-read that recalls the work of Kim Stanley Robinson. Brush gives a familiar trope an original and exciting twist.”
—Library Journal (SFF Debut of the Month, starred review)
“At the center of Brush’s turbulent debut is a rogue ocean, the Caul, on an ecologically compromised future Earth… . Brush keeps the pages turning with twisty conspiracy theories and exciting scenes of Mae wielding her survival skills with cinematic flourish, surrounded by the Caul’s ‘inter-dimensional’ quantum foam….the earnest and detailed characterizations and worldbuilding mark Brush as a sci-fi writer worth keeping tabs on.”
—Publishers Weekly
“With a dual narrative, a twisty mystery, unusual science, and religious and political intrigue, Brush’s debut will find fans among both sf and mystery readers.”
—Booklist
“[A] dramatic setting [that] will remind many readers of past stories with wastelands that hold mute phenomena at their heart. These include the Strugatsky brothers’ Roadside Picnic, and more recent works such as Jeff Vandermeer’s Annhilation. Or, with a more particular British flavour, the works of JG Ballard and Robert Holdstock’s Where Time Winds Blow … As well as engaging emotively, this is science fiction that challenges the reader to think. “
—Dev Agarwal, The BSFA Review
Colin Brush
Colin Brush was born in Scotland and reluctantly raised on the small Channel Island of Jersey. After a sojourn studying geology in Glasgow, he moved to London and consequently worked as a bookseller, stock controller, proofreader, copyeditor, quarterly zine publisher, catalog and advertising copywriter, and currently works as a jacket copy writer at the UK’s largest publisher. Over the last quarter century he has written the cover copy for well over 5,000 books. He lives with his partner and their two daughters on the southeastern coast of England, a few miles from Dungeness, the wave-battered and pebble-beached wilderness that is the inspiration for Exo.
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