A criminal nicknamed "Le Marseillais" hires two detectives, Pauline and Laura, to protect his back when he has to attend a closed-door meeting with two rival gang leaders who want to share "areas of influence". The first, nicknamed "The Irishman", shows up at the meeting accompanied by his friend Françoise; when the second, the Greek Buciaculis - who has the firm intention of eliminating the competition that evening - arrives with his wife Sonia...