Mortal Engines is a Sci – Fi fantasy novel by Phillip Reeve who won the Blue Peter Book of the Year 2003.

Mortal Engines is a four book series that also has a three book prequel series called Fever Crumb. The story is set in a post – apocalyptic future where moving cities hunt each other to the death.
The main character of the book is a 15 year old historian called Tom, who longs to leave future London and go on an adventure like his hero, Thaddeus Valentine, the head of the Historian’s Guild. He gets more than he bargained for when he falls through a waste chute and is stranded with a stranger in the great hunting ground of the Traction Cities. Tom is sent on a mighty adventure that changes his life and his view on the Traction Cities. But something stirs in London’s G.U.T
Mortal Engines is my favourite book series because of the concept of the Traction Cities and the theory “Municipal Darwinism” which states that machines, especially cities, will evolve to suit their environment and that only the fastest, largest and most powerful machines will survive to make new generations of equally powerful ones.
I would rate Mortal Engines four and a half out of five, but in order to rate it for yourself go look for it in a library or in your local bookshop.