She lives on the Earth, underground. He lives on the moon, in a dying habitat. Only together can they save the human race. This young adult speculative fiction/romance novel is set in a future world in which nanotechnology has been allowed to evolve into artificial intelligence. Rima Birde lives in a matriarchal, restrictive society hiding underground on Earth. Truman Forrester lives in the Ark, a habitat built on the moon to shelter humans fleeing Earth. Both have felt different all their lives without knowing why. When both find a way to return to Earth, they discover not only what makes them unique but that their "gift" is critical to human survival. Told in alternating points of view.