In 1925, she and Bloch, who remained business partners after their divorce, founded an economic newspaper, La Gazette du Franc et des Nations.

Banks began to investigate the nonexistent companies and soon were numerous rumours about Hanau's shady business practices.

Hanau protested that the court did not understand financial business, could return all the money, and should be released on bail.

Paris Police Prefect Jean Chiappe from Corsica was afraid that she would die in his hands and requested for her to be released on bail.

In April 1932, she published an article about the shady side of the financial markets and quoted a Sûreté file about herself.

Police arrested her, but she refused to reveal who had leaked the file except that it had been taken from Finance Minister Pierre-Étienne Flandin.

[6] A French movie, "La Banquière" (The Lady Banker), by Francis Girod, was made in 1980, starring Romy Schneider as "Emma Eckhert", a thinly-fictionalized Hanau.