A Darker Shade of Magic - V E Schwab

STEP INTO A UNIVERSE OF DARING ADVENTURE, THRILLING POWER, AND MULTIPLE LONDONS.

Kell is one of the last Travelers-magicians with a rare, coveted ability to travel between parallel universes, connected by one magical city.

There's Grey London, dirty and boring, without any magic, and with one mad king-George III. Red London, where life and magic are revered-and where Kell was raised alongside Rhys Maresh, the rougish heir to a flourishing empire. White London-a place where people fight to control magic, and the magic fights back, draining the city to its very bones. And once upon a time, there was Black London. But no one speaks of that now.