Thunder City set to roll into the Mortal Engines universe.

In completely unexpected news, Philip Reeves has announced a new Mortal Engines novel, Thunder City.

It will be set prior to the events of the original novel, making it a 4th prequel novel in the series. 

Here's the synopsis that has been released for Thunder City:

"Tamzin Pook is a fighter in the Amusement Arcade. And what she does best is killing Revenants.

All she knows is survival, having arrived in the Arcade as a small child. She pushes away her memories, her hopes, and her fears, and she emerges into the arena to battle the Revenants--dead brains nestled in armored engine bodies. She doesn't dare to hope or wish for anything more than to survive another day.

Meanwhile, the wheeled city of Motoropolis has been taken over by a rebel faction who killed its leaders and commandeered the city. Its only hope is a teacher named Miss Torpenhow who's determined to find the Mayor's good-for-nothing son and force him to take back what's rightfully his. But to get to him, she'll need to find someone who's skilled at fighting Revenants.

With a daring abduction, Miss Torpenhow and Tamzin Pook's destinies are entwined, and so begin their adventures together...

This stand-alone Mortal Engines novel follows an unlikely crew of fighters-turned friends: Tamzin Pook, Hilly Torpenhow, mayor-to-be Max Angmering, and washed-up mercenary Oddington Doom. Together, they must find a way to outwit the assassins that are determined to drag Tamzin back to the arcade, and try to take back Motoropolis."

Motoropolis - heh, great to Reeve is still doing great puns. 

Here's the book cover, done by Ian McQue who re-did all the covers for the series a few years back:



Reeve has said of his new work:

"The rule I set for myself when I was writing this one was that it shouldn’t feature any of the people or places from previous Mortal Engines books. So Thunder City takes place just over a century before the original book, when the town-eat-town world of Traction Cities is slightly less ruthless than it will become later, and none of the characters from the original quartet has even been born yet. (I suppose Mr Shrike must be bimbling about somewhere, but he’s still just yer basic implacable killing machine at this point so there’s not much point in paying him a visit). So hopefully this new take will be accessible to people who’ve never read Mortal Engines, and hopefully people who have read it will enjoy an adventure set in the same world."

Look for a September release date. Pre-orders are available on Amazon. 

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Themes of Thunder City from Mortal Engines by Philip Reeve

The world of Philip Reeve’s Mortal Engines—scarred by the apocalypse known as the Sixty Minute War and dominated by colossal, rolling cities locked in endless predation—has haunted readers with its relentless, mechanized brutality and poignant humanity for over two decades. Now, with Thunder City, Reeve invites readers to witness a critical era that shapes the bleak yet vibrant tapestry of Municipal Darwinism: the so-called “Golden Age of Traction.” 

It’s a time when the elaborate rituals of city hunting retain at least a veneer of civility, masking a savagery that simmers just below the surface. Traction cities still roam hungrily across the ravaged landscape, their engines roaring as they chase down prey, but there’s a trace of honor, a fleeting nod to fair play soon to vanish completely.

Yet beneath these civil façades lies the eternal paradox of progress, a theme that Thunder City explores relentlessly.

 The marvels of traction technology—the massive engines, intricate gears, and towering upper tiers—are celebrated achievements of engineering genius, but also stark symbols of humanity’s self-destructive ambition. Just as traction cities exemplify human ingenuity, they simultaneously embody humanity's greatest flaw: the perpetual drive for more at any cost. 

The gleaming metal towers of Thorbury, floating serenely in the sky before Strega’s coup, perfectly illustrate this duality. They stand as proud monuments to human achievement even as they represent looming symbols of dominance and exploitation.

This thematic conflict crystallizes in Gabriel Strega himself. 

Initially Thorbury’s respected Chief of Planning, Strega’s transformation into ruthless dictator reflects the corrupting power of absolute authority and unchecked ambition. His desire to transform Thorbury into the apex predator of a new, merciless age reveals the ease with which ideals and principles collapse when confronted with temptation. 

Reeve thus demonstrates how swiftly civilization’s thin veneer can crack, exposing raw power and brutality beneath. Strega's descent also echoes the lore of the original Mortal Engines quartet, foreshadowing characters like Thaddeus Valentine, whose charisma and idealism mask similarly dangerous intentions.

In parallel to Strega’s destructive ambition runs another central tension—the enduring friction between traction and static societies. This ideological schism lies at the core of the Mortal Engines universe. While static settlements seek stability, rooted to the land and their traditions, traction cities embrace mobility, change, and consumption. 

The narrative of Thunder City examines the birth pangs of these divisions, revealing how Municipal Darwinism inevitably creates a zero-sum world. Strega’s aggression accelerates this process, intensifying the bitterness and resentment that eventually blossom into the full-blown conflict with the Anti-Traction League depicted in the later books. The cycle of predation, resentment, and rebellion becomes clear: every hunted town breeds survivors who dream of revenge.

The book’s moral heart beats strongest in the intertwined stories of Tamzin Pook and Miss Lavinia Torpenhow. Tamzin, hardened by her brutal life as a slave fighting Revenants—nightmarish hybrids of machinery and human remains—embodies the struggle for survival in a harsh, commodified world. Her existence, previously defined solely by violence and exploitation, mirrors the wider societal exploitation inherent in traction civilization. Her eventual escape from Margate’s Amusement Arcade isn’t merely physical; it’s symbolic, marking a broader rejection of a society that treats humans as expendable resources.

Miss Torpenhow, in contrast, begins her journey as an embodiment of genteel civility, educated and morally driven yet wholly unprepared for brutality. Her progression from tutor to revolutionary leader underscores another core theme: ordinary individuals driven by extraordinary circumstances. 

As the unlikely partnership between Tamzin and Torpenhow deepens, Reeve returns to a persistent thematic motif from the original series—the transformative power of human connection in a dehumanizing environment. Like Tom Natsworthy and Hester Shaw, their evolving relationship illustrates the strength born of shared hardship and the surprising tenderness found amid ruin.

Reeve also continues his exploration of the human cost of technological hubris through the chilling presence of Revenants, precursors to the later Stalkers. These ghastly creations, both tools of oppression and entertainment, symbolize how easily humanity's moral compass can be corrupted by scientific ambition. 

Just as Shrike embodies tragic humanity in the original series, the Revenants of Thunder City are grim warnings against blurring the lines between life and machinery, forcing readers to confront unsettling questions about progress’s ethical limits.

Ultimately, however, the story's underlying optimism shines through the grimness. 

The formation of a found family between Tamzin, Torpenhow, Max Angmering, and the roguish mercenary Oddington Doom reasserts a fundamental theme of hope in a hopeless world. Each character, shaped by vastly different hardships, ultimately finds purpose and belonging through camaraderie and shared ideals. Their bond becomes a counterpoint to the otherwise ruthless society surrounding them—a living critique of Municipal Darwinism itself.

In crafting Thunder City, Reeve doesn’t simply add to his lore; he deepens and complicates it. The book enriches the series’ historical context, capturing the precise moment when the seeds of later conflicts take root. It adds nuance to the world's lore by depicting tractionism’s early days not as simply idyllic or brutal but as a complex mixture of both—civilities masking savagery, idealism disguising ambition, technological marvels cloaking potential horrors.

The novel's climax and resolution reinforce the recurring thematic tension between destructive ambition and hopeful resistance. Strega’s rise and fall are stark reminders of the fragility of civilizations built on domination, suggesting that no power founded solely on consumption can endure.

Conversely, the novel’s ragtag heroes exemplify the durability of humanity’s spirit and the possibility of redemption through connection.

By the time readers reach the final page of Thunder City, Reeve has not only revisited familiar themes of power, technology, and humanity’s self-destructive impulses but also expanded the moral complexity of his world. This prequel stands firmly on its own merits while providing fresh layers of context that enhance our understanding of the original Mortal Engines saga. It roars as a narrative that vividly illustrates the ever-present struggle between humanity's darkest impulses and brightest hopes—leaving readers with a haunting sense of both dread and promise for the battles yet to come.

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