Having cleared his name, genius mechanic Lino has only one goal in mind: getting revenge on the corrupt cops who killed his brother and his mentor.

Young and ambitious Captain Vivés has just been appointed group leader at the Grenoble Criminal Squad when Clara's murder case lands on his desk. Vivés and his team investigate Clara's complex life and relations, but what starts as a professional and methodical immersion into the victim's life soon turns into a haunting obsession.

Facing a murder charge, a genius mechanic with a criminal past must track down a missing car containing the proof of his innocence: a single bullet.