K.O.

Bastien is a professional MMA fighter whose career was cut short three years ago after a tragedy: in a fight, he accidentally killed his opponent. Consumed by guilt, the man retreats into the shadows - giving up sports and public life, trying to forget the past. But one day the widow of the deceased fighter finds him with an unexpected request: her son Leo has gone missing in Marseille. The woman asks Bastien for help, as he took the boy's father away, and therefore must redeem his guilt and find the teenager. Bastien agrees. In his search for the boy, he encounters Kenza - a young, but determined policewoman who is fighting her own battle against the criminal elite of the city. It turns out that Leo witnessed a crime, which is why he is being hunted. Together, Bastien and Kenza delve into the investigation, where every step brings them closer to the brutal truth and deadly danger.