Jan Wong, a Canadian of Chinese descent, went to China as a starry-eyed Maoist in 1972 at the height of the Cultural Revolution. A true believer--and one of only two Westerners permitted to enroll at Beijing University--her education included wielding a pneumatic drill at the Number One Machine Tool Factory. In the name of the Revolution, she renounced rock & roll, hauled pig manure in the paddy fields, and turned in a fellow student who sought her...