In 1960s Toronto, two girls retreat to their attics to escape the loneliness and isolation of their lives. Polly lives in a house bursting at the seams with people, while Rose is often left alone by her busy parents. Soon they discover they're actually neighbors, sharing a wall. They develop an unlikely friendship, and Polly is ecstatic to learn that Rose can actually see and talk to ghosts. Maybe she will finally see one too! But is there more to Rose than it seems? Why does no one ever talk to her? And why does she look so ghostly? When the girls find a tombstone with Rose's name on it in the cemetery and encounter an angry spirit in her house who seems intent on hurting Polly, they have to unravel the mystery of Rose and her strange family before it's too late.