The story picks up not long after the conclusion of A Web of Air and will once again follow the series' main character Fever Crumb, an ex London engineer.

One of Philip Reeve's blog posts shed some light on the series before its release.

The Arkangelsk return to the series in this book but will be shown in an entirely different light than their descendants who were prominent antagonists in the original Mortal Engines Quartet.

In a future land once known as Britain, nomad tribes are preparing to fight a terrifying enemy - the first-ever mobile city.

Before London can launch itself, young engineer Fever Crumb must journey to the wastelands of the North.