Anchor Lisa Mullins speaks with Canadian journalist Jan Wong about her new book, "A Comrade Lost and Found." In the early 1970s, Wong was one of only two Western exchange students at China's Beijing University. At one point Wong was approached by a Chinese student who wanted to go to the U.S. Wong, who supported Chairman Mao's Cultural Revolution, reported the student to her teacher. Years later, a conscience-stricken Wong returned to China to try to trace the student and learn her fate. Along the way, she revisited many of the characters she knew in her youth and her book chronicles the changes which have taken place in China over the past three decades.