In the old prison of Pont-L’évêque there is a feast: people disguised as policemen, wardens, judges and prisoners show the life of the “happy” prison.There is now a visit of the prison.And surprise the female guide finds a hanged man, the judge Daniel.Among the the visitors the police commander Frank Roussel and his brother the police captain Julin Roussel: both will work together in this investigation.They meet Marion, the former female clerk who worked with the judge Daniel,she explains them that the judge was a solitary man living with his mother.The female medical examiner explains that the judge Daniel receive a strong punch in the head ,then he has been hanged with a silk scarf.