The Shades of Magic (trilogy slipcase) - V.E. Schwab

Most people only know one London; but what if there were four? There's Grey London, dirty and crowded and without magic, home to the mad king George III; Red London, where life and magic are revered; White London, ruled by whoever has murdered their way to the throne; But once upon a time, there was Black London... Meet Kell Maresh, one of the last Travellers, and Lila Bard, a thief with quick and fingers ambition for great adventures. Together, they will fight to save all these Londons, and preserve the delicate balance of magic. Discover the spectacular fantasy phenomenon that is the Shades of Magic trilogy.