When all the adults in tiny Brockton, Connecticut morph into monsters overnight, the teens barricade themselves in their high schools. They turn them into castles and develop different societies.

Hard-partying Moore builds a neo-feudal society based on a popular video game where everyone goes out and slays the "dragons."

Prestigious magnet school Jefferson lives in the dark, sending out their athletes to raid for canned goods while their student council debates how to avoid starvation.

They know they must slay the monsters, or become them. But when they meet again after almost a year, they want most to conquer each other.