After their last visit to the naturist campsite, several strange tracks lead Constance and Jonas to suspect Paulo and Francine for the death of Maurice Lauzon. Is it the stolen objects or Maurice's body which is at the bottom of the lake? In the meantime, the squad is about to arrest Eddy Bazin.

The search organized by Sylvain to find his father is postponed due to the absence of the dog handler. Constance and Jonas take the opportunity to question Paulo and Francine. They are now serious suspects for the murder of Maurice Lauzon, but Fred and Antoine doubt it. A double murder occurs in Sainte-Thérèse.

Eddy Bazin goes to the police. Will he admit the entire plan behind the assassination of Stephano Cozzolino? Fred and Antoine are in shock when they learn the identity of the original target. Constance and Jonas await confirmation from the divers to search the lake and arrest Paulo and Francine.