In a world terraformed into a wasteland by alien invaders, only one stronghold remains. Nestled amongst the rocky mountains and protected by the desolate peaks stands, the Rox. Ava, leader and mother of three, knows their time is running out as the alien creatures draw closer every year.
Their only hope for survival lies hundreds of miles across the alien scarred badlands and right in the middle of Cheyenne Mountain. With no other options left she sets in motion a plan that takes her only son Adan, into the heart of the mountain, and forces her estranged daughter Faye to risk everything to save him.