Mira, Kay, and Peter have finally returned home, but not everyone is happy to see them. Despite the town bullies who never fail to remind the young merrows just how different they are from the rest of the townsfolk, the adventurers try to enjoy the remainder of their summer break from school...until a devastating fire reminds them of the evil that is still lurking in the shadows. After discovering the true identity of the malicious leader of the Shadowveils-the hooded merrows who hunt and imprison anyone who gets in the way of their mysterious missions-it seems their troubles have only just begun.

With their eyes opened to a secret world of sorcery, Mira, Kay, and Peter turn to the only place where they can learn more about what they're up against: fairy stories. They soon find out that the tales they had heard growing up might hold the key that will help them save their friends from a terrible curse. As they journey into abandoned cities, treacherous hideaways, and deep into the sea, they must stay vigilant to distinguish friend from foe and work together if they hope to stay one step ahead of the Shadowveils and keep their loved ones safe.