The development of fusion power in the small colony established on Mars leads to an explosive outward emigration from Earth to the moons of the solar system. On Earth, increasing civil unrest in Europe has led to the election to positions of authority of three strong women: Leda in Germany, Madeleine in France, and La Marquesa in Spain. With the assistance of others—including Tomiko from Japan and Hinchcliffe, with her paramilitary organization, the Legion—order is restored, at least temporarily. The lives, loves, and deaths of these women are set against a world of conflict, hope, and despair, as they struggle to maintain civilization and allow further immigration to the high frontier in the face of malevolent opposition forces.