Etienne, happily married to his wife Clémence, is about to take over from his father-in-law as the head of an industrial company that makes cleaning products, but his chance meeting with childhood friend Patrick turns everything upside down. Etienne confesses to him that he owes the rapid rise of his career to the fact that, 12 years previously, he stole the formula for a stain remover sent by Michelet,..