London is a teeming warren of thieves and cutthroats. Young Jack fits right in. But when he picks the wrong pocket, he finds himself in a London far more dangerous than he ever imagined. A metropolis of spies and dark magic. A city that will change him. A city where devils are real.

Andrew Prentice and Jonathan Weil met at school where they edited the school magazine together. Since then they have collaborated on running a circus, and writing dialogue for robots, as well as writing novels.