Philip Reeve books in order
12 books in the catalogue, about 82 hours of reading in all; the shortest takes 5 hours and the longest 10 hours.
3 series and 4 standalone books in the catalogue.
Mortal Engines Quartet
6 books 1 
Mortal Engines 5.4 h 
Infernal Devices 6.6 h 4 
A Darkling Plain 10.3 h
Mortal Engines 5.4 h 2 Predator's Gold length not known
3 Infernal Devices 6.6 h 4 A Darkling Plain 10.3 h Traction City length not known
Night Flights length not known
