Kell is one of the last Travelers, a magician with the rare ability to travel between parallel universes. There's Grey London, dirty and boring, without any magic, ruled by a mad King George. Then there's Red London, where life and magic are revered, and the Maresh Dynasty presides over a flourishing empire. White London is ruled by whoever has murdered their way to the throne and people fight to control magic, and the magic fights back, draining...