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 acquitted. It was a lost cause: Ranucci was sentenced to death and executed. When Patrick Henry's trial took place, Héloïse wrote a letter dictated by her conscience. Robert Badinter read it out in court. Héloïse begged that another mother, Patrick Henry's, be spared the torment she had endured...

Tanguy is 28 years old and still living with his parents. They think it's time he moves out. He doesn't, so they hatch a plan.

For Pierre Brochant and his friends, Wednesday is “Idiots' Day”. The idea is simple: each person has to bring along an idiot. The one who brings the most spectacular idiot wins the prize. Tonight, Brochant is ecstatic. He has found a gem. The ultimate idiot, “A world champion idiot!”. What Brochant doesn’t know is that Pignon is a real jinx, a past master in the art of bringing on catastrophes...