Captain Joe Tillman, a retired Navy Seal and Officer of the Watch witnesses the attack firsthand and the bloodshed that begins shortly afterwards. Meanwhile, Eric and a group of fellow park visitors in North Carolina are thrust together and must face the first days of desperate chaos as they try to find a safe haven to ride out the coming storm. As modern life and the social order it brings begins to break down, each of these two groups must come face to face with the brutality that resides deep within us all.