An asteroid knocks the moon closer to Earth, and every conceivable natural disaster occurs. Seventeen-year-old Alex Morales's parents are missing and presumed drowned by tsunamis. Left alone, he struggles to care for his sisters Bri, 14, and Julie, 12. Things look up as Central Park is turned into farmland and food begins to grow. Then worldwide volcanic eruptions coat the sky with ash and the land freezes permanently. People starve, freeze, or die of the flu. Only the poor are left in New York—a doomed island—while the rich light out for safe towns inland and south.