In November 2014, thirteen members of the Biden family gathered on Nantucket for Thanksgiving, a tradition they had been celebrating for the past forty years; it was the one constant in what had become a hectic, scrutinized, and overscheduled life. The Thanksgiving holiday was a much-needed respite, a time to connect, a time to reflect on what the year had brought, and what the future might hold. But this year felt different from all those that had come before. Joe and Jill Biden's eldest son, Beau, had been diagnosed with a malignant brain tumor fifteen months earlier, and his survival was uncertain. "Promise me, Dad," Beau had told his father. "Give me your word that no matter what happens, you're going to be all right." Joe Biden gave him his word.