One evening, Mady – a young student by day, a locksmith by night – receives an emergency call from Claire, who is supposed to open a lock. But the door that the young woman wants to open does not belong to her, and neither does the bag that she runs off with. It belongs to Yannick, a brutal gangster who blames Mady and will stop at nothing to get his stolen goods back. Mady has only one night to prove his innocence and save his skin. What begins as an ordinary night shift develops into a brutal descent into violence.