The Minivers' enemies are triumphant. Emily is a prisoner, shut up in the home of her ex-security guard. Rosamund is alone in the world and in charge of both their fates. With the evil Madame hot on her heels, her only hope is to find the room where the secret of the Minivers' mysterious existence has been hidden since their birth. Or else the Minivers lose their throne, and their kingdom forever. This is the third story in a four-book series of exciting adventures about two great new characters.