Ex-Isle, Clines Peter

But even for the Mount, survival still balances on a razors edge--and after a disaster decimates the towns food supply, the heroes must make a risky gamble to keep its citizens from starving.

And then the news arrives of a strange, man-made island in the middle of the Pacific. An island populated not just by survivors, but by people who seem to be farming, raising children, living--people who, like the heroes, have somehow managed to keep the spark of civilization alive.