This must be the place by Maggie O'Farrell

Meet Daniel Sullivan, a man with a complicated life. A New Yorker living in the wilds of Ireland, he has children he never sees in California, a father he loathes in Brooklyn and a wife, Claudette, who is a reclusive ex-film star given to shooting at anyone who ventures up their driveway. He is also about to find out something about a woman he lost touch with 20 years ago, and this discovery will send him off-course, far away from wife and home. Will his love for Claudette be enough to bring him back?