Aram, a young man from Marseille of Armenian origin, blows up the Turkish ambassador's car in Paris. Gilles, a young cyclist who was passing at that precise moment, is seriously injured. Aram's mother feels guilty and feels the need to visit Gilles at the hospital and beg for his forgiveness, something that Gilles does not understand. Against the advice of his comrades in Beirut, Aram decides to go meet his victim.

A young woman in a lesbian relationship keeps a diary that is stolen by a young man who loves her.

From his offices in Switzerland, Russian Igor Lipovsky is engaged in a vast and profitable gunrunning operation with Africa. The French government wants to hinder the activities of the arms dealer and sends a team to sink one of his ships heading for Angola with a load of illegal weaponry. Lisa, Brisseau, Loïc, Tony and Raymond are professionals: they carefully set up their cover, plan all their moves meticulously, and carry out orders without asking questions. Perhaps they should. The code-name of the mission is "Janus"; and just like with the ancient deity, there are two opposite faces for every aspect of the operation: the objective of the French government, the role of each team member, the presumed friend and the assumed foe...