Marble was an American tennis player who began playing at age 15 and rose rapidly in the national tennis rankings after 1931. She won 18 Grand Slam championships: five in singles, six in doubles, and seven in mixed doubles. Her personal life, however, was filled with tragedy and intrigue. Her husband was killed during World War II, just days after Marble had suffered a miscarriage. She attempted suicide but recovered and, in 1945, began spying for US intelligence. What was her mission? Discuss
Source: The Free Dictionary