Coastliners by Joanne Harris

On the tiny Breton island of Le Devin, life has remained almost unchanged for over a hundred years. For generations, two rival communities have fought for control of the island’s only beach. When Mado returns home ot her village after a ten-year absence, she finds it threatened, both by the tides and by a local entrepreneur. Worse, the community is suffering from an incurable loss of hope. Taking up the fight to transform the dying village, Mado must confront past tragedies, including the terrible secret that still haunts her father.