Max, a ruthless 50-year-old hitman, discovers he has a problem: he now faints at the drop of blood. With his future in the profession in jeopardy, he's going to have to retrain... But not so simple when his only professional skill is to kill people... They are helped by a couple of young neighbors, Karim and Stéphanie, who do not imagine for a moment who they are dealing with... Max becomes attached, in spite of himself, to the young couple, until his past catches up with him.