Captain Rik Boehmer is the first native of the colony on Luna, to which his ancestors fled, to leave that colony and enter military service. Because he and other Earth inhabitants fled from compulsory amalgamation of species, people have ostracized him, allowing him to come home only for the purpose of fathering children in order to conserve the precious "pure Human" genes his body carries. Now the Humans have a plan, and they're ready to take back their world at any cost. So Rik Boehmer, caught squarely between his duty to his comrades and his love for his young family on Luna, has some hellishly difficult choices to make.