Neef is a changeling, a human baby stolen by fairies and replaced with one of their own. She lives in "New York Between," a Manhattan alongside our own, home to creatures of folklore. Protected by her fairy godmother until she breaks a Fairy Law, now she must face the challenge of the Green Lady of Central Park or be sacrificed! Neef is determined, but time is running out.

Neef, the official Changeling of Central Park, has survived a life-threatening quest, but that’s nothing compared to her first experiences at Changeling school. At Miss Van Loon’s, she meets her counterparts from all over Manhattan, learns the basics of diplomacy, and, of course, gets in trouble. This time Neef must recover the Magic Mirror, or else New York Harbor’s Mermaid Queen will turn all of the city’s fresh water to salt—and everything will die.