If you liked Harry Potter, then give these a try:

Stolen by Sarah Prineas; illustrations by Antonio Javier Caparo

The hound of Rowan by Henry H. Neff

The lives of Christopher Chant by Diana Wynne Jones

The Amulet of Samarkand by Jonathan Stroud

Inkheart by Cornelia Funke; translated from the German by Anthea Bell

A world without heroes by Brandon Mull

The lost years of Merlin by T.A. Barron

Peter and the Starcatchers by Dave Barry and Ridley Pearson; illustrations by Greg Call

The secret of platform 13 by Eva Ibbotson; illustrated by Sue Porter

The amazing Maurice and his educated rodents by Terry Pratchett

Midnight for Charlie Bone by Jenny Nimmo

Magyk by Angie Sage; illustrations by Mark Zug

Beyond the Deepwoods by Paul Stewart & Chris Riddell