The Amulet of Samarkand - Jonathan Stroud

Presenting a thrilling new voice in children's literature-a witty, gripping adventure story featuring a boy and his not-so-tame djinni.
Nathaniel is a young magician's apprentice, taking his first lessons in the arts of magic. But when a devious hotshot wizard named Simon Lovelace ruthlessly humiliates Nathaniel in front of everyone he knows, Nathaniel decides to kick up his education a few notches and show Lovelace who's boss. With revenge on his mind, he masters one of the toughest spells of all: summoning the all-powerful djinni, Bartimaeus. But summoning Bartimaeus and controlling him are two different things entirely, and when Nathaniel sends the djinni out to steal the powerful Amulet of Samarkand, Nathaniel finds himself caught up in a whirlwind of magical espionage, murder, blackmail, and revolt.
Set in a modern-day London spiced with magicians and mayhem, this extraordinary, funny, pitch-perfect thriller will dazzle the myriad fans of Artemis Fowl and the His Dark Materials trilogy. And with the rights sold in more than a dozen countries, and a major motion picture in the works, the Bartimaeus trilogy is on the fast track to becoming a classic.