Book excerpt: "Hourglass is an inquiry into how marriage is transformed by time--abraded, strengthened, shaped in miraculous and sometimes terrifying ways by accident and experience. With courage and relentless honesty, Dani Shapiro opens the door to her house, her marriage, and her heart, and invites us to witness her own marital reckoning--a reckoning in which she confronts both the life she dreamed of and the life she made, and struggles to reconcile the girl she was with the woman she has become."