One evening, Mady, a young student by day, a locksmith by night, receives an emergency call from Claire to open a lock. But the door the young woman wants to open is not hers, and neither is the bag she runs away with. It belongs to Yannick, a vicious gangster who blames Mady and will stop at nothing to recover her stolen goods. Mady has only one night to prove her innocence and save her skin. What began as a routine night shift turns into a brutal descent into violence.