After three quiet years, Claude and Vision find themselves at odds. One seeks a quiet life, while the other desires a chance to explore the vast spectacle of the universe. Into their perpetual arguments comes a Sabien Scierocet, a highly effective spy and assassin, offering something both have been missing. He seeks the aid of Silver Sights, but new threats travel in his wake. With dangers on every side and a shroud cloaking the Sabien's true motives, Claude and Vision must find a way to unravel the mystery. But to do that, they will need to find something each thinks to be lost...Unity.