You don't have to have been coming into the Library for long to find out that Philip Reeve is one of my favourite authors. In particular I love his Mortal Engines series. If you too have read the books from Mortal Engines to A Darkling Plain, why not read Fever Crumb the prequel to Mortal Engines?
Fever Crumb is set a generation before Mortal Engines and explains the origins of the traction cities and of the character the stalker Shrike. It is an exciting adventure which is also peppered with humour - look out for the cult that worships "Hari Potter"!!
Fever Crumb can be read without having read any of the other books. The series is of a genre known as "steampunk" this refers to books set in an age when steam power was still widely used, often the Victorian era, but features futuristic inventions and ideas.
For more information about the author Philip Reeve and all of his books: