In Had I Known, the former host of Good Morning America, health advocate, international speaker, mother of seven, grandmother of one, and New York Times best-selling author Joan Lunden speaks candidly about her battle against breast cancer, her quest to learn about it and teach others, and the transformative effect it has had on her life.

With a large extended family counting on her, giving up was not an option. After announcing her diagnosis of stage two triple negative breast cancer on Good Morning America, people all over the country rallied around Joan as she went into warrior mode. Joan appeared on the cover of People bald, showing the world her brave resolve and that breast cancer does not need to define you.

Joan's illness has changed her in profoundly unexpected ways and has redefined her values and, most of all, her health. Following a new clean and healthy way of eating, Joan became her best advocate by taking control of her nutrition, which helped combat the adverse side effects of chemotherapy like a warrior.

Uncharacteristically vulnerable, irreverent, and straight from the heart, Had I Known is a deeply personal and powerful story of pain, persistence, and perseverance in which Joan openly evaluates her decision to go public with her battle, shaving her head, wig shopping, reconnecting with her viewers, rediscovering her purpose, and ultimately realizing that sometimes you have to look back to move forward.