In 1979, Firmin Crets was one of the best boxers of Belgium. But almost thirty years later he now works as a handyman in the boxing club “De knock out” of its former adversary Freddy White. He lives alone with his hamster who is a great boxer too. One day, Mohammed comes to the club, because he wants Firmin to become his trainer, but White will have nothing of it and denies him membership because of Mohammed’s origin. Afterwards White also fires Firmin. Firmin eventually accepts the challenge, to train Mohammed and receives help from Germaine, with whom he had a love affair. They prepare themselves for the Belgian championship, but in the final game of the competition they will have to face the best boxer of Freddy White, whom is also the reigning champion of Belgium.