The events of the novel revolved around the story of Annaïg Hoïnart, a young Breton; Mere-Glim, her Argonian friend; Prince Attrebus, only son of the emperor Titus Mede; Colin, a Penitus Oculatus agent; and Ezhmaar Sul, a vengeful Dunmer and how their destinies tie into that of the dangerous and looming Umbriel, a floating city.