This essay discusses the memoir of Boria Sax, the son of Saville Sax, a U.S. citizen who was a Communist and Soviet spy during World War II. Saville Sax failed at most things he attempted, but he proved to be a valuable asset for Soviet espionage agencies because he was the roommate of the gifted physicist Theodore Hall, who was recruited to work for the Manhattan Project. Sax convinced Hall, who shared Sax's admiration of the Soviet Union, to supply highly sensitive information to the Soviet foreign intelligence service. The memoir offers a poignant view of the terrible impact that Saville Sax's actions had on his family as well as on the country he betrayed.