In a world of frock coats, solar sails, and rigid class boundaries, Lucy joins the Martian Imperial Navy as a midshipman. Mars and Earth are at war, and Lucy hopes for quick promotion. But when she arrives aboard ship, she finds her childhood ex-friend, Moira, already there. Class differences got in the way of their budding romance five years ago, and both of them are nursing grudges. Those same class differences are threatening...