Ruins of the Fall - The Remnants Trilogy, #2

Sometimes ruins are a symbol of hope. Following the events of ASHES OF THE FALL, con man Luke Stokes flees to where no one can survive: the ruins of the western North American Circle. But the same factions that forced him into a corner still relentlessly pursue Luke through the ashen wastes. With no one to trust, Luke follows a trail of faint clues to locate a mysterious new faction hidden deep within the ruins.
In doing so, he might discover how to fix what remains of civilization. If he can evade the current lords of the crumbling continent long enough to survive.