In Arilloa, the royal family uses their magic to win the respect of the ordinary populace. But Leonie, a princess and second in line to the throne, has a terrible secret: she’s barely magic at all. The only person to ever find out her secret is Armand, a boy training to become a Knifecloak, one of the elite castle guards.
Leonie’s younger brother, Hiss, on the other hand, is a child prodigy with greater powers than anyone else in the family, capable of creating monsters out of thin air. One day Hiss goes missing and resurfaces at the head of a rebellion, using his powers to strike against the country and the crown. Monsters against soldiers, magic against normality. Leonie and Armand must find Hiss and stop him while the monster-driven war rages around them.