Ayana Mathis talks about her debut novel, The Twelve Tribes of Hattie. Starting in 1923, it tells the story of the children of the Great Migration through the life of Hattie Shepherd. She leaves Georgia at the age of 15 in search of a better life and settles in Philadelphia. As she grapples with her own disappointment, she raises her large family to face a world that she sees as harsh and unloving. Oprah Winfrey recently chose the book for her Book Club 2.0.