Thousands of years after a cataclysmic explosion forever changes the atmosphere of the Earth, shelter dweller Evan journeys to the world's surface in search of a way to help his people survive. What he finds is Rourke, a descendent of the humans who stayed above. They're different: Evan and the other shelter dwellers are hairless, while Rourke and the other "Commons" have evolved fur to protect them from a harsher sun. As Evan searches for answers, the two men feel a growing attraction for one another, but Evan has been raised to think of Commons as subhuman. Can they look past appearances to explore their passion?