Book III of The Bartimaeus Trilogy. Two thousand years have passed since Bartimaeus the djinn was at the height of his powers, invincible in battle and friend to the great magician Ptolemy. Now trapped on Earth, Bartimaeus finds his energies waning fast. Meanwhile, undercover in London, fugitive Kitty Jones has been stealthily completing her studies on magic and demons. She has a plan that she hopes will break the endless conflict between djinn and humans - but first she must uncover the secrets of Bartimaeus' past. Cover art by David Wyatt.