Lucretia Sanderson has a secret. Lucretia and her mother have come to tiny Candle Island, Maine (Population: Summer, 986; Winter, 315) to escape—escape memories of the car accident that killed her father and escape the journalists that hound her mother, a famous and reclusive artist. The rocky coast and ocean breeze are a welcome respite for Lucretia, who dedicates her summer days to painting…