The Darkest Part of the Forest by Holly Black (Author)

Hazel and her brother, Ben, live in Fairfold, where humans and the Folk exist side by side. Since they were children, Hazel and Ben have been telling each other stories about the boy in the glass coffin, that he is a prince and they are valiant knights, pretending their prince would be different from the other faeries, the ones who made cruel bargains, lurked in the shadows of trees, and doomed tourists. But as Hazel grows up, she puts aside those stories. Hazel knows the horned boy will never wake.