In a future where humanity is extinct and vampires rule Mars, Lexi - a troubled five-hundred-year-old immortal - is ordered to father a child with a mysterious clone named Primeva, whose very existence defies the laws of God and science. Before her fragile body fails, they must return to the ruins of Earth, where Lexi can reclaim his lost soul - for only as a mortal man can he unite with Primeva to restore humankind.​