The Maker of Monsters by Lorraine Gregory

Description

Brat has always lived in the isolated castle on the island, taking care of the vicious creatures that his master creates, waiting in terror for the moment when they are ready to be put to use. But then the unthinkable happens. The monsters get out.

Now Brat must overcome his fears, and venture into the world he has hidden from his whole life. For the fate of everyone rests on his shoulders alone…