France, a sports teacher by day, a worker by night, is an active campaigner against the use of pesticides. Patrick, an obscure and solitary Parisian lawyer, is a specialist in environmental law. Mathias, a brilliant lobbyist and man in a hurry, defends the interests of an agrochemical giant. Following the radical act of an anonymous person, these three destinies, which should never have crossed paths, will jostle, collide and ignite.