Suzy and Nancy Goodman were more than sisters. They were best friends, confidantes, and partners in the grand adventure of life. For three decades, nothing could separate them. Not college, not marriage, not miles. Then Suzy got sick. She was diagnosed with breast cancer in 1977; three agonizing years later, at thirty-six, she died. It wasn’t supposed to be this way. The Goodman girls were raised in postwar Peoria, Illinois, by parents who believed that small acts of charity could change the world. Suzy was the big sister—the homecoming queen with an infectious enthusiasm and a generous heart. Nancy was the little sister—the tomboy with an outsized sense of justice who wanted to right all wrongs. The sisters shared makeup tips, dating secrets, plans for glamorous fantasy careers. They spent one memorable summer in Europe discovering a big world far from Peoria. They imagined a long life together—one in which they’d grow old together surrounded by children and grandchildren. Suzy’s diagnosis shattered that dream. 'Promise Me' is a deeply moving story of family and sisterhood, the dramatic “30,000-foot view” of the democratization of a disease, and a soaring affirmative to the question: Can one person truly make a difference?