A Louvre curator dies from poisoning in front of a Géricault painting depicting death and agony.

Florence and Verlay use Géricault's "Portraits of the Insane" to track down the killer.

Antoine and Florence are on the trail of a particularly talented copyist of Claude Monet's work. They come to realise that the life of the one strangely mirrors that of the other. Worrying parallels lead them towards a sombre story of passion and jealousy.

The murderer inspired by Gustave Courbet seems determined to follow his Machiavellian plan right to the end. One question remains: why does he appear to address himself directly to Antoine?