Zak is standing on the subway platform when the tunnel starts to fill with water. He sees it before anyone else; a voice only he hears warns him to run. His friends Moira and Khalid believe this is more than a premonition, and soon all three find themselves in an alternate universe that is both familiar and seriously strange. As Zak unravels the mystery behind the voice, he faces decisions that may mean the end of their world at home-- if they can even get home!