Answer
Shi Pei Pu was a Chinese spy who disguised himself as a female opera singer and married a Belgian diplomat, Bernard Boursicot, who was unaware of the ruse. Shi Pei Pu was able to steal valuable information from Boursicot, including nuclear secrets, over the course of their 20-year relationship. The story of Shi Pei Pu and Boursicot was made into the 1994 film "The Farewell My Concubine."