The film is based on a true story in France. One day in July 1982, the male protagonist learned of his daughter's death. His daughter was only 14 years old and was on vacation in Germany with her mother and stepfather before she died. However, soon, doubts arose about the circumstances of her death. The biological father had been entangled with the French court and the German prosecutor's office for 30 years for the true cause of his daughter's death, but Germany had always refused to extradite his daughter's stepfather to France for trial. In the end, the biological father kidnapped him to France for trial.