When twelve-year-old Andy Ferguson arrives at the Irish manor house that is to be his new home he sees a woman dressed in black looming down from an upper-story window. On enquiring who she is, he is told he's mistaken. She doesn't exist. So who is this mysterious creature? Is she a ghost? And what about the eerie harp music that fills the house at the strike of midnight. Andy and the servant girl, Catie, go on a quest to find the answers to these and other questions. And Andy finds he has the power to free the mysterious midnight harp player from the curse that binds her to his house.