The Legend Thief: The Hunter Chronicles

Sky thought he had problems before, when his uncle disappeared, his family moved to an odd new town, and he kept the world's deadliest monster imprisoned. But now, the entire Hunters of Legend are coming to Exile to kill him. Turns out he needs the same friends that he kept in the dark to keep safe, to stop an unspeakable evil from wreaking havoc on the world. Sky has more monsters to fight—and lives to save—in the thrilling sequel.