Books like Skeleton Man

Ever since the morning Molly woke up to find that her parents had vanished, her life has become filled with terrible questions. Where have her parents gone? Who is this spooky old man who's taken her to live with him, claiming to be her great-uncle? Why does he never eat, and why does he lock her in her room at night? What are her dreams of the Skeleton Man trying to tell her? There's one thing Molly does know. She needs to find some answers before it's too late.