These Shattered Spires

A crossover upper-YA Gothic fantasy set in a world where ghosts live in mirrors, dead nuns stalk the corridors and magic is real but comes with the price of pain. When the king dies, protagonists Taro, Nixie, Alix and Elliot are thrown into a battle for the fifth tower. If they don't find an escape, they'll be battling the worst monsters they can imagine – each other.