Most people only know one London; but what if there were several? Kell is one of the last Travelers—magicians with a rare ability to travel between parallel Londons. There's Grey London; dirty and crowded and without magic; home to the mad king George III. There's Red London; where life and magic are revered. Then; White London; ruled by whoever has murdered their way to the throne. But once upon a time; there was Black London...