A new door opens...

Once there were four worlds, nestled like pages in a book, each pulsing with fantastical power and connected by a single city: London. After a desperate attempt to prevent corruption and ruin in the four Londons, there are only three?Grey London, thriving but barely able to remember its magical heritage; Red London, ruled lately by the Maresh family, flourishing and powerful; and White London, left to brutality and decay. Now the worlds are going to collide anew?brought to a dangerous precipice by the discoveries of three remarkable magicians.