No one who knows Courtney Crumrin would ever call her a "good little girl," but few realize what she's truly capable of. Among the magical community, only the lawkeeper Templeton suspects the truth about her magic abilities. To her classmates, she is merely the grim, quiet girl in the back row. That is, until they decide to dabble in forbidden spells and see what happens when they turn little Joey into a night thing. Only Courtney knows the way through goblin town and the means to find a cure for Joey's unfortunate state.