Joseph, who has become closer to Caroline, tries to gather as much evidence as possible to bring down Mathias. After a difficult investigation, he finds the trace of Cathy... For his part, Mathias continues a game which becomes more and more dangerous. Forced to expose himself, he seems to be put in difficulty. But this is without counting on his Machiavellianism, which will bring him into the best position... to the great displeasure of Joseph.