On June 3, 1974, eight-year-old Marie-Dolorès Rambla was kidnapped in Marseille. The little girl's body was found a few days later. Christian Ranucci quickly became the prime suspect. A couple claimed to have seen him get out of a car at the spot where the body was discovered, carrying a large package. While in custody, Christian Ranucci confessed to the murder. But he eventually recanted his confession. His mother, Héloïse, convinced of his innocence, began a relentless fight to try to get him ...