"L'emprise" is the story of a drama, adapted from the moving book-witness "Acquitted", by Alexandra Lange. The story of a mother of four children, which is found in March 2012 in the dock of the foundations of Douai for the murder of her husband. How does a woman manage to kill the father of her children with a knife? During the three days of the trial, panting narrative takes us into the daily life of Alexandra, a mother that the society has failed to protect, neither she nor her children from the control of a monster she has loved. Through this incident that made headlines and upset the public, an event movie that raises the question of the balance of justice. Will she be heard?