The town where Ben and Hazel live is small, everyone knows everyone else’s business and there’s a hardy tourist trade. Oh, and it also is right up against a fey filled forest. And there’s a boy with horns asleep in their backyard. And Ben’s best friend is a changeling whose human mother tricked his fairy family so she could keep him.
Ben and Hazel grew up going on pretend quests and learning as many fairy stories as they could from around the world, so that they’d know what to do when their adventure came. It was only a matter of time, because before Hazel was even born Ben had been touched by a fairy who gave him the gift/curse of being amazing at playing/writing music. But, for the most part (give or take that time Hazel made a deal with the Alderking to get her brother a music scholarship) nothing much happened.
Until the horned boy woke and broke out of his coffin. But the adventure that Ben and Hazel find themselves on isn’t nearly as much fun as they’d dreamed as kids. Their town and their family are in danger and magic and wishes turn out to be nothing to mess around with.
If you like your fairy tales to be a little darker and scarier with seriously high stakes, than you should check out Holly Black's gorgeously written take on them.