The Devil You Know — Alan Tucker

Two alien races vie for control of Earth amidst a human population decimated by a merciless plague, famine, and war. Meanwhile, the denizens of Hell grow restless. The apocalypse they were supposed to instigate and revel in is happening without them... Doing their best to create new lives in the aftermath of the chaos triggered by the aliens' arrival, Abraham Black and Neri White come from backgrounds about as different as their last names would indicate. Yet, together, they may hold the key which allows humanity to remain the primary tenants of Earth. The question is: how much are they willing to give up to save the world? Their memories? Their lives? Their souls?