Peppered moth. Margaret Drabble. 2001.

Bessie Bawrty was a gifted child who studied hard to escape from a dismal future in the South Yorkshire mining town of Breaseborough, and confused  and confounded her parents in the process. Nearly a century later, Faro, her granddaughter, attends a lecture on genetic inheritance. She has returned to the depressed little town to find that all around her are families who have been there for as long as anyone can remember. Could it be that, despite her glamour and the influence of her father’s wild, foreign blood, she hasn’t really travelled any further than her small-town kin?