The body of a man disguised as a pirate is found on the beach. Visibly drowned dead, he is bound feet and fists, would he have suffered the torment of the board? And who is this man, would he be a real pirate? Paul and Leah discover that he had received the famous black mark as in the treasure island, someone threatened him ? Is it related to the treasure of Gaspard Dot that the victim claimed to have discovered ?

Cécile Bazin, director of the zoo, is found dead in the cheetah enclosure. Despite the bite marks, it was not the cheetah that killed her. Would we have wanted to make believe an accident by letting the beast enter the enclosure when he should have spent the night in his dressing room ? Léa and Paul discover that Cécile did not lack enemies. She had received hundreds of threats since the announcement of euthanasia of a baby cheetah born with a genetic defect. Was she killed to save the animal ?