In 2015, citizens of the United States are put in underground "vaults" for the remainder of a massive war, to keep them safe. Two hundred years later the doors of the vaults open, and everyone inside is slaughtered.
A couple of ordinary kids going about their average day at school, but that all changed when a terrorist group broke into their school and were ready to kill them all in order to set up a head quarters in the U.S.A., so they could ready an attack on America to take it under their control. Their plan was working until a couple of gutsy kids decided to fight back and beat them back or die trying.