When Nazi Germany occupied the Netherlands in 1940, most Dutch citizens faced a choice between resistance and collaboration. Florentine Rost van Tonningen chose collaboration. A committed admirer of Adolf Hitler and National Socialism, she devoted her life to the Nazi cause and became one of the most controversial women in modern Dutch history.

Born into a respected family, Florentine was drawn to Nazi ideology while still a student. During the German occupation, she married Meinoud Rost van Tonningen, one of the most powerful Dutch collaborators and president of the Dutch central bank. Together they supported the vision of a Netherlands closely aligned with the Third Reich while thousands of Dutch Jews were deported to camps such as Sobibor and Auschwitz.

After the Second World War, Florentine refused to abandon her beliefs. She maintained friendships with former Nazis, publicly praised Hitler and Heinrich Himmler, denied the Holocaust, and became a symbol of post-war neo-Nazi activism in the Netherlands. Her home served as a gathering place for far-right supporters for decades, earning her the nickname "Black Widow."

This is the story of Florentine Rost van Tonningen, one of the most notorious Nazi sympathizers in Dutch history and a woman who never renounced the ideology she embraced in the 1930s.