Exo, Colin Brush
Exo, Colin Brush
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Exo
A Novel

Author: Colin Brush

Narrator: Gildart Jackson

Unabridged: 13 hr 50 min

Format: Digital Audiobook Download

Published: 11/18/2025


Synopsis

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 Earth is deadly. Over hundreds of years, its oceans have transformed into an annihilating liquid entity–—the Caul. Every living creature approaching its shores is irresistibly compelled to enter. . . and is never seen again.
Scientists, some of the few inhabitants left, work in facilities seeking to understand and stop the Caul. And scavenging the shores are the penitents—those who resist its siren lure.

Reviews

Goodreads review by domsbookden on November 15, 2025

*2.5 Sci-fi mystery is quickly becoming a favorite genre blend of mine, but Exo didn’t deliver on the aspects of the genre I enjoy most. The pacing is sluggish and lacks momentum, with the story unfolding too slowly to sustain engagement. What should build tension instead dissipates it, and the narra......more

Goodreads review by Brandon on November 29, 2025

Exo by Colin Brush is a gripping sci-fi debut that pulls you into a desolate future Earth where humanity’s remnants orbit above, leaving the planet to its own eerie devices. The story follows an aging agent unraveling a scientist’s murder amid the mysteries of the Caul, this weird, deadly ocean-like......more

Goodreads review by Katie on November 26, 2025

Thank you NetGalley and Dreamscape Media for the ARC of this audiobook. I was not a fan of how the narration was done. It was supposed to be two different characters, a male and female, and after some time, it got confusing on who was supposed to be talking and where you were supposed to be in the bo......more

Goodreads review by Emily on January 31, 2026

Exo is set on a future Earth that humanity has largely abandoned after the oceans transformed into something known as the Caul. The Caul is an incomprehensible, hyperdimensional force that irresistibly draws living beings into it, never to be seen again. Most of humanity now survives in orbital habi......more

Goodreads review by Jessica on November 15, 2025

Exo is a unique dystopia set on an ecologically compromised future Earth, where an ominous gray mass pulls living beings into it. The setting feels stark and real, lending ecological dread a sharp edge. The pacing can sag at times, and the protagonist makes a few credibility-straining choices, espec......more