Dragon's Green - Paperback –by Scarlett Thomas 
 
IF YOU HAD SECRET MAGICAL POWERS, HOW WOULD YOU KNOW?

After the Worldquake, Effie knows about magic - time in her grandfather's library has made sure of that. But there's still much she has to learn. About the Otherworld. And about the Diberi, a secret organisation with plans to destroy the entire universe.

Effie and her school-friends are the only ones who can stop them . . . and time is running out.