The Cloud Horse Chronicles: Guardians of Magic

The Cloud Horse Chronicles: Guardians of Magic written and illustrated by Chris Riddell.
 
The Kingdom of Thrynne is a place where fairy tales don't behave, and magic can be found in unexpected places.
But magic brings danger to Zam, Phoebe and Bathsheba, because it is forbidden. Now, the future of magic itself is under threat from powerful enemies: those who fear it and, worse, those who want to use it for their own ends. What can three ordinary children do to protect it?