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. Polly is a down-to-earth dreamer with a wild imagination and an obsession with ghosts; Rose is a quiet, ethereal waif with a sharp tongue. But soon they discover they aren't alone--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?