Los ríos color púrpura

Niemans presencia la muerte de un monje, quien, antes de morir, emite las palabras "la espada y la serpiente" y tiene la palma quemada para ocultar un tatuaje. Junto con Camille intentan resolver el misterio.

The investigation by Niemans and Camille revealed that the band BHP of the rock singer Messionier hides a group of extremely violent Satanists responsible for the murders of the two monks, the death of the mayor's young daughter and the disappeared girls.

In a chapel on the estate of the "God’s Grape Harvesters", a Christian sect in Rosheim, reverend Samuel Toschi apparently died in the restoration of the frescoes on the vaulted ceiling. While the local police have already stopped the investigation, as they assume an accident, commissar Niemans, who has travelled from Paris, has come to the conclusion that this is a homicide case.

Nieman's investigation indicates that the "God’s Grape Harvesters „consider themselves as God’s-chosen people who have always practiced inbreeding in order to preserve the purity of the blood and reproduce themselves in this way.

Dos hombres que buscan drogas en un aparcamiento encuentran la mano cortada de un niño. Niemans y Camille investigan.

Niemans and Camille convict the head of the youth welfare Michel Lagorce and the police officer Stéphane Gandolfi as perpetrators and accomplices of the murders in Roubaix. In the nineties, abused themselves in the children's home Saint Vincent, they lead, with the support of some children from the home, a campaign of revenge against those who were responsible.