Fran's twin sister Carli has vanished. Everyone thinks she's run away. But they don't know what Fran knows. And they don't see what Fran sees... an unscheduled train in the dead of night with a sea of frightened, ghostly faces pressed against the windows of its carriages. Fran soon realises that her sister's life depends on her. But how will she ever find and enter the haunted land of shadows... and if she does, will she return?