Aisin Gioro Xianyu (1907-1948) was the fourteenth daughter of a Manchu prince and a legendary figure in China's bloody struggle with Japan. After the fall of the Manchu dynasty in 1912, Xianyu's father gave his daughter to a Japanese friend who was sympathetic to his efforts to reclaim power. This man raised Xianyu, now known as Kawashima Yoshiko, to restore the Manchus to their former glory. Her fearsome dedication to this cause ultimately got her killed.

Yoshiko had a fiery personality and loved the limelight. She shocked Japanese society by dressing in men's clothes and rose to...