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 ?