Father Mark Wycliffe, a Roman Catholic priest and space engineer, flees from Earth's wars by serving aboard a Mars space station. Above Mars, he meets a mysterious woman who claims to be the Virgin Mary. He is skeptical of the vision; could it be an illusion created by asteroids called Siren Stones? Later, on the Moon, he meets Jessica, a teenage girl in a Catholic school uniform. Jessica loves to shop in the Moon's largest shopping mall and hang...