The enduring mystique.
In her own words, she was an international woman. She spoke several languages, she traveled around Europe constantly, she had lovers in every country, it seemed. With the advent of war, borders were secured, passports required, questions asked. Ambiguity and mystery were no longer assets, but instead brought her rapidly to the attention of the authorities. She was a woman with no fixed home, no husband, no steady source of income.
Needull in a haystack 
Very interesting, and sad.