"A brilliant study of the wages of mortal love." -- The New York Times Book Review What does it mean to be a success? To be a good parent? To live a meaningful life? Emily Rapp thought she knew the answers when she was pregnant with her first child. But everything changed when nine-month-old Ronan was diagnosed with Tay-Sachs disease, a rare and always-fatal degenerative disorder. He was not expected to live beyond the age of three. Rapp and her husband...