After nearly drowning, Cassidy learned to lift the veil that separates the world of the living from the world of the dead. Her best friend is a ghost. Everything in her life is already difficult, but it will become much more complicated when her parents take part in a television show about the most famous places in the world associated with supernatural phenomena. The Cassidy family goes to Scotland, to Edinburgh - the City of Ghosts, where cemeteries and castles are infested haunted. Cass has a lot to learn, and she'll have to learn quickly, because the City of Ghosts is more dangerous than she thinks.