Hollis Palmer thought that stopping the aliens from blowing up Austin and rescuing Mia would leave him free to live his life in peace - at least as much peace as could be expected from a world suddenly overrun with aliens. But the aliens have other plans. All around him, Hollis is finding people whose brains have been zapped by the invaders, and now they are little more than zombies. The whole thing seems to be centered on the nearly ubiquitous Astral app that first predicted their arrival. Now, Hollis and Mia must face their final - and hardest - task yet: