In their continuing adventures, magician's apprentice Nathaniel, now fourteen years old, and the djinni Bartimaeus travel to Prague to locate the source of a golem's power before it destroys London.
Nathaniel, a young magician's apprentice, becomes caught in a web of magical espionage, murder, and rebellion, after he summons the djinni Bartimaeus and instructs him to steal the Amulet of Samarkand from the powerful magician Simon Loveland.