The final book in the New York Times bestselling Moonfall series from thriller master James Rollins, a sweeping tale of relentless adventure and survival in a world on the brink of annihilation.



The world is ending.



As earthquakes shatter continents and storms ravage the skies, the moon descends—its burning face growing larger each day. Impact is imminent. Extinction is certain.

Nyx and her allies have one last hope: two colossal engines buried deep within the planet’s core, capable of restoring the world’s spin and casting the moon back into orbit. But such power requires a lost key—one sought by others.

An undying figure of bronze rises to claim it: an ancient enemy of unmatched strength and cunning, determined to turn moonfall into a weapon of total annihilation.

As war engulfs the Crown, Nyx and her companions must fight their way toward the Fist, a deadly volcanic stronghold hidden beyond the Mýr swamps. Here, alliances fracture, wills are broken, and hope fades amid wonders that defy the imagination and horrors that threaten sanity.

Because the truth behind the key is more dangerous than anyone imagined.

To save the world, Nyx must make an impossible choice—one that will decide if she becomes its savior… or its destroyer.

The Moonfall Series:

The Starless Crown

The Cradle of Ice

A Dragon of Black Glass

A Fist of Molten Fire

At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.



Praise for this book

Praise for the Moonfall series:

“This talented storyteller moves smoothly from thriller to fantasy. A terrific bit of storytelling.”—Terry Brooks, New York Times bestselling author of the Shannara novels

"A masterful storyteller across the genres, James is at his best in The Starless Crown."—R. A. Salvatore, New York Times bestselling author of The DemonWars Saga

“A bold and brilliant epic fantasy by a master storyteller! Wonderfully complex characters, shifting points-of-view, unparalleled world-building, and a great sense of fun make this a certified triumph!”—Jonathan Maberry, New York Times bestselling author of Relentless and Kagen the Damned

"The writing is gorgeous, textured and full of detail, a notable shift from the stripped-down prose of the Sigma Force novels, and the world and its inhabitants are beautifully crafted. For lovers of fantasy fiction, a must-read."—Booklist

"The fast pace of its action sequences will keep epic fantasy readers engaged."—Library Journal

"Gripping and thought-provoking. The high stakes and smooth writing made it a page turner."—Mystery & Suspense Magazine

“Fun… Readers looking for plot-driven fantasy will enjoy the action.”—Publishers Weekly

"Readers will want to continue their journey with Nyx and her companions…as the middle story in a huge epic that blends the science fiction of a tidally locked planet with elements of fantasy and magic."—Library Journal




About the AuthorJames Rollins is the #1 New York Times bestseller of international thrillers, sold to over forty countries. His Sigma series has earned national accolades and has topped charts around the world. He is also a practicing veterinarian, who still spends time underground or underwater as an avid spelunker and diver.
Title: A Fist of Molten Fire
Author(s): James Rollins
Series: Moonfall
Volume: 4
ISBN: 9781250768209
Copyright 2026
Release Date: December 01, 2026
Publisher: Tor Publishing Group
Countries: United States, Canada | Learn more about available countries
Language: English
Format: None available | Learn More about our supported formats
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