The breathtaking new novel from the author of STILL ALICE, which was adapted into an Oscar-winning film starring Julianne Moore. Joe O'Brien is a Boston cop; his physical stamina and methodical mind have seen him through decades policing the city streets, while raising a family with his wife Rosie. When he starts committing uncharacteristic errors - mislaying his police weapon, trouble writing up reports, slurred speech - he attributes them to stress. Finally, he agrees to see a doctor and is handed a terrifying, unexpected diagnosis: Huntington's disease. Not only is Joe's life set to change forever, but each of his four grown children has a fifty-fifty chance of inheriting the disease. Observing her potential future play out in his escalating symptoms, his pretty yoga teacher daughter Katie wrestles with how to make the most of the here and now, and how to care for her dad who is, inside, always an O'Brien.