Four people hatch a scheme to fight corporate corruption from the inside in this thriller with comic undertones. Naterris is a powerful multi-national firm dealing in chemicals and agricultural products. When it's discovered that Naterris has been illegally dumping toxic waste into a lake in rural France, the company is hit with a class action lawsuit, and they opt to settle out of court, authorizing a $15,000 payout to each claimant. While most of the locals are happy with the settlement, four of them are convinced they've been cheated -- Melanie (Marie Gillian), an accountant; Denis (Jean-Paul Rouve), who runs a restaurant; Zak (Roschdy Zem), who raises oysters; and Kevin (Adrien Jolivet), an office worker. Certain that Naterris was eager to settle in order to avoid an investigation that could uncover further wrongdoing, the four decide to get the goods on the company by taking low-level jobs in their corporate headquarters that will give them access to their files. Part one of the scheme goes well enough as all four are hired by Naterris, but they soon find that digging up their dirty secrets isn't as easy as they thought after dealing with the head of the firm's legal team (Guilaine Londez), the top security officer (Wilifred Romoli) and their financial overseer (Scali Delpeyrat).