A Darker Shade of Magic by V.E. Schwab

Kell is one of the last Antari—magicians with a rare, coveted ability to travel between parallel Londons; Red, Grey, White, and, once upon a time, Black.

Kell was raised in Arnes—Red London—and officially serves the Maresh Empire as an ambassador, travelling between the frequent bloody regime changes in White London and the court of George III in the dullest of Londons, the one without any magic left to see.

Unofficially, Kell is a smuggler, servicing people willing to pay for even the smallest glimpses of a world they’ll never see. It’s a defiant hobby with dangerous consequences, which Kell is now seeing firsthand… Read more.