In 1955, a 21-year-old white woman named Carolyn Bryant claimed a black teenager, Emmett Till, made sexual advances toward her. That claim led to Till's kidnapping and murder. Historian Timothy Tyson says the woman has broken her silence for the first time to recant her story. Tyson joins "CBS This Morning" to discuss his new book, "The Blood of Emmett Till," which examines Bryant's claims.