One night, Mady, a young student by day and a locksmith by night, receives an emergency call from Claire, who must pick a lock. But the door the young woman tries to open does not belong to her, and neither does the bag she flees with. It belongs to Yannick, a brutal gangster who blames Mady and will stop at nothing to recover his stolen goods. Mady has only one night to prove her innocence and save her skin. What begins as a normal night shift turns into a brutal descent into violence.