"If the world ever ends and we become separated, I want you to meet me at the Falls." Thinking their father was joking, the Murphy family laughed the idea off that night at dinner. Little did they know, a devastating event would soon bring civilization to an end. But the end was only the beginning of the family's problems. Now, a mysterious light blazes in the sky day and night dropping metallic pods deep underground. Armed militias roam broken streets for the few remaining resources, killing anyone who opposes their order. Mankind has turned into the monsters they've always feared. Alone and desperately trying to survive as society unravels into chaos, the Murphy family must find a way back to one another by doing what their father told them such a long time ago: MEET ME AT THE FALLS

The world crumbles beneath the Murphy family’s feet as the mystery surrounding what caused the apocalypse deepens. Each member of the family encounters new survivors attempting to recover what they've lost—or kill each other trying. As the Murphys continue their trek toward the Falls, everyone and everything stands in their way.

As the Murphy family takes another step toward the Falls, they begin to stumble. Charlotte must escape a deadly pack of "wolf" children in order to find her own. Edwin and Tricia fall in with shady mercenaries hell-bent on saving Seattle. Wiley encounters a reclusive Native American tribe hiding by Snoqualmie Falls. And Alan becomes trapped inside a secret complex where scientists may have discovered why the world ended...and when it may happen again.

The closer the Murphy family gets to the Falls, the further apart they split. Still recovering from his injuries, Wiley watches as old and new worlds collide in a battle that will forever change the Snoqualmie Tribe. Charlotte clings to hope, and to the horse that is on its last legs beneath her. Alan, unable to escape his confines inside the mountain silo, delves deeper into the mysterious experiments that may have triggered the apocalypse. And Edwin and Tricia become separated from each other as the citizens of Seattle attempt a desperate gamble to save their drowning city.

Though the Falls are so close... the Murphy family couldn't be further apart. What they hoped to be an oasis in the vast desolation of America has become an unending nightmare. Tricia, lost. Charlotte, injured. Edwin, disillusioned. Wiley, shot. And Alan still miles and miles away. In this final part of the series, the family wonders: will they actually meet at the falls?