Policemen Simon and Franck are celebrating the end of an assignment, when they cause a fatal car crash. Whilst Franck is uninjured, Simon, who was drink-driving, is seriously wounded and loses his job. Six years later and now divorced, Simon struggles to be a father to his son Theo. Out of loyalty to his old friend, Franck watches over the boy from afar. After Theo witnesses a Mafia killing, Simon and Franck must reunite to do whatever it takes to protect Theo from his pursuers.