A seasoned F.B.I. Agent's child-genius son assists him on catching a child-killer, a schizophrenic mohab nut who believes he's been chosen by god to be a new Noah.

In a future where the polar ice-caps have melted and Earth is almost entirely submerged, a mutated mariner fights starvation and outlaw "smokers," and reluctantly helps a woman and a young girl try to find dry land.