Clayton Shepard is lost, cold, alone, and determined to find his way home. But he's landed on a planet he doesn't recognize. Earth isn't the same place he left months earlier. There is little light, no heat, and limited communication. As he works to find his way back to his family, they cope with the struggles of a new reality and a quickly devolving society. What none of them know is that the radioactive blast that plunged their lives into darkness was only the first one. More is on the way.