Fifteen-year-old Sam Hain lives in the quiet town of Hartwick Hollow, where he helps his father look after the town's spookiest residents. Between school, helping his overworked father, and doing chores for his blind neighbor Mrs. Murdoch—a banshee with a taste for tea—Sam’s used to keeping secrets. But when Mrs. Murdoch delivers a cryptic warning, Sam begins to suspect something dark is creeping closer to home.