Isabelle works under Christine at the French subsidiary of a large US multinational. While both women appear to be similar and compatible, they are very different. Christine manipulates Isabelle and steals her brilliant ideas, turning them to her own advantage. A ruthless battle gradually breaks out between them. Christine exploits her position of authority and becomes cruel. Publicly humiliated and almost crushed, Isabelle prepares to take revenge. Imaginative and calculating, she turns into a perfect murderer, weaving the web of her plot and an irrefutable way to emerge completely innocent.