In 1933, in Le Mans, the particularly appalling murders of Madame Lancelin and her daughter, Geneviève, made the headlines. The two domestic workers, Léa and Christine Papin, soon admit their appalling package. They killed their employers with a knife and hammer and pulled their eyes out. The reason for this massacre seems futile: a banal argument which would have degenerated into rage. After the press, public opinion and justice, psychoanalysts, then writers and finally filmmakers will take over this incredible affair, dominated by the elusive personality of the two sisters.