Jenny Nimmo books in order
9 books in the catalogue, about 58 hours of reading in all; the shortest takes 3 hours and the longest 7 hours.
9 standalone books in the catalogue.
Standalone books
Charlie Bone and the Red Knight 7.3 h 
Snow Spider 2.9 h 
Charlie Bone and the Time Twister 7.0 h 
Midnight for Charlie Bone 6.5 h 
Charlie Bone and the Invisible Boy 7.0 h 
The Castle of Mirrors 7.3 h 
Charlie Bone and the Hidden King 6.8 h 
Charlie Bone and the Beast 6.6 h 
Charlie Bone and the Shadow 7.2 h