It's been eight years since the Assembly (an alien race) took over Earth and captured all the adult population. Eight years that Holt Hawkins has spent as a bounty hunter in a world ruled by rebel youths. Holt is transporting his latest prisoner, Mira, to the Midnight City to collect his reward when the two come across a crashed Assembly ship with a young girl named Zoey trapped inside. Together, they rescue Zoey and soon discover her magical abilities that could stop the Assembly for good.