An electromagnetic pulse flashes across the sky, destroying every electronic device, wiping out every computerized system, and killing billions. Alex hiked into the woods to say good-bye to her dead parents and her personal demons. Now desperate to find out what happened after the pulse crushed her to the ground, Alex meets up with Tom ? a young soldier ? and Ellie, a girl whose grandfather was killed by the EMP. For this improvised family and the others who are spared, it's now a question of who can be trusted and who is no longer human.