Showing Dr. Bloodmoney by Philip K. Dick

Seven years after the day of the bombs, Point Reyes was luckier than most places. Its people were reasonably normal -- except for the girl with her twin brother growing inside her, and talking to her. Their barter economy was working. Their resident genius could fix almost anything that broke down. But they didn't know they were harbouring the one man who almost everyone left alive wanted killed . . .