Mortal Engines Ending, Book Differences & Sequel Setup Explained

Hugo Weaving Robert Sheehan and Hera Hilmar in Mortal Engines Ending

WARNING: Spoilers for Mortal Engines ahead.

Mortal Engines' ending doesn't just see the end of London's attempt to destroy the Anti-Tractionists, it sets up a future sequel (and more). Set in a post-apocalyptic future where giant moving cities traverse a desolate Europe left dry by long-lost technological weapons, Mortal Engines is based on Phillip Reeve's book of the same name, which spawned three sequel novels and a prequel series.

The main story of the film concerns Tom Natsworthy (Robert Sheehan), a Historian on London whose life is thrown in repeated danger when he crosses paths with Hester Shaw (Hera Hilmar), a nomad disfigured as a child by London's Head Historian Thaddius Valentine (Hugo Weaving) and raised by powerful Resurrected Man Shrike (Stephen Lang). Hester meets Tom during a failed assassination attempt on Valentine, and together the pair run against the clock and Shrike to find a way to stop him London from enacting its awful plan: to use old tech called MEDUSA to destroy the Shield Wall protecting a stationary society to the East and feast on the new resources.

Related: Screen Rant's Mortal Engines Review

The finale of Mortal Engines is a mad-dash mix of Mad Max: Fury Road and Star Wars as the heroic duo - along with noted Anti-Tractionist Anna Fang (Jihae) - rush to stop Valentine in time. Against all the purple-hued whizz-bang, though, Mortal Engines is also bringing its bigger ideas to a conclusion and setting up where the series could be going.

Mortal Engines' Hester Valentine Twist Explained

Valentine and Hester in Mortal Engines

The big twist at the end of Mortal Engines is that Hester Shaw is actually Thaddeus Valentine's daughter. Although this arrives incredibly suddenly (and the father is killed moments later), the groundwork for it is laid throughout the story.

Hester's mother, Pandora Shaw, was a historian in Out-Country who worked with Valentine, looking specifically into MEDUSA tech. In this time, the couple wound up in a relationship and Hester was conceived. However, Valentine deserted his potential family upon gaining status in London and fathering Katherine, subsequently using his discoveries to further the city's dark goals. When Pandora found the computer brain for MEDUSA, Valentine killed her (and, in the books, her husband), scarring Hester in the process. This story is told somewhat in reverse by the film to hide the twist, while in the books Pandora married David Shaw, who was assumed to be Hester's father until the reveal.

Valentine's death at the end of Mortal Engines would seem to nullify any long-term impact of the Hester Valentine twist, but it can actually be read as rounding off her story arc. From the beginning, Hester has been striving to find her life's purpose and with that a proper sense of identity, something lost the day her mother died (symbolized by the scar which causes her to hide her face). Her attempts at this, however, are self-destructive; Shrike offers an emotionless out as a Resurrected Human, then the mission to avenge her mother by killing Valentine only brings her back to the start with the paternal reveal. It's only through her relationship with Tom that Hester's freedom is finally achieved.

Related: Mortal Engines & The Hobbit Made The Same Mistakes - Why Is Only One "A Failure"?

What Happens In Mortal Engines Ending (& What It Really Means)

London in Mortal Engines

At the end of Mortal Engines, Anna Fang is killed in battle with Valentine, London is destroyed by Tom using Fang's ship the Jenny Haniver to attack its engine core, and Hester takes on Valentine atop another airship. Tom saves Hester and sends Valentine's craft towards the ground, where it's crushed by London's treads just before it stops. The Shield Wall is safe, the other key Anti-Tractionists survived (as did Katherine Valentine and Bevis Pod on London), and Tom and Hester fly off into the sky where they finally admit their love for each other.

While much of Mortal Engines' ending is framed from the point-of-view of its characters and thus feels rather intimate, this is actually a rather seismic event in the mythology. London was one of the biggest moving cities in the world, a force that instilled fear in all who caught glimpse of it on the horizon; this threat was doubled when dwindling resources caused it to make the bold and desperate move into Europe and towards the Shield Wall. Its destruction is a major win for the Anti-Tractionists, and the start of a bigger conflict.

That resolution also rounds off a lot of the key themes running through the story. A major point is climate change and how our current approach is simply riding us towards destruction. This is called out explicitly by Tom's discussion of how our present world fell, and forms the backdrop to London's plight; the final battle, of trying to survive where so many others have fell before, is an exercise in futility. More than just promoting an environmental message, though, Mortal Engines turns the lens to the actions of the those in charge, criticizing a lack of action of the London mayor and the self-serving, short-sighted view of Valentine. There are pretty clear parallels to both President Trump's view on climate change, as well as the UK's current predicament with Brexit (although considering the book was first published in 2001 and the movie  filmed in 2017, any commentary should be taken as more generalized).

Related: Mortal Engines Accidentally Remakes Batman v Superman's Martha Scene

A lot of this is lost - along with the deeper aspects of character conflict, such as Shrike's debate over change for survival - due to Mortal Engines' disjointed story and flitting focus, but this is at the very least what Christian Rivers' film is going for.

Page 2 of 2: Mortal Engines' Book Changes & Sequel Setup

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Key Release Dates
  • Mortal Engines (2018) release date: Dec 14, 2018
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