Mady leads a double life as a student by day and a locksmith by night. One evening, he helps out Claire, an enigmatic young girl who calls him to the door of an apartment that is not hers. The bag she wants at all costs to recover is not hers either, but that of Yannick, a man to whom Mady must be accountable. Caught in a hellish chase, Mady has only one night to prove his innocence and save his skin.