V.E. Schwab 
A Conjuring of Light 

The precarious equilibrium among the four Londons has reached its breaking point. Once brimming with the red vivacity of magic, darkness casts a shadow over the Maresh Empire, leaving a space for another London to rise. Kell begins to waver under the pressure of competing loyalties. Meanwhile, an ancient enemy returns to claim a crown and a fallen hero is desperate to save a decaying world…

About the author

V.E. Schwab is the No.1 New York Times bestselling author of ten books, including This Savage Song and the Darker Shade of Magic series, whose first book was described as “a classic work of fantasy” by Deborah Harkness. It was one of Waterstones’ Best Fantasy Books of 2015, The Guardian’s Best Science Fiction novels, and a Telegraph choice for the Best Young Adult Books of 2015. The Independent has called her “The natural sucessor to Diana Wynne Jones.”