Mortal engines - Philip Reeve

Tom and Hester have been thrown together. Truly-thrown out of a city
on wheels that's left them stranded and starving in the middle
of nowhere while it hares off after its prey. Hester is desperate
for revenge, and Tom is only desperate to get back on board his
beloved London.
This is a stunning literary debut from Philip Reeve. A novel that
defies easy categorisation, it is a gripping adventure story set
in an inspired fantasy world, where moving cities trawl the globe.
Peopled with convincing and utterly likeable characters, this
story is a magical and unique read.