William's Picks
Magyk by Angie Sage
A boy called Boy 412 and a girl called Jenna are the main characters. 

This book has a complicated plot centered on the origin of the characters  and their families.

I loved this book: it is full of magic and suspense.

Flyte by Angie Sage

The same characters but a different adventure I liked this book more than the first.
Physik by Angie Sage

This is the best so far.