A conscientious night watchman, Xenophon, at the risk of his life, saves the secret books of a factory during a fire. The bosses are trying to get them, in every way, each of them separately, because the books show on the one hand that one stole the other and on the other hand they had extramarital relations. So the night watchman gets involved in endless tragicomic situations ...

An unbeatable gentleman, he meet a widow, owner of a nightclub that has a hidden casino in its own. He goes in the club, plays cards and wins at first. But when he starts to lose large amounts, he understands that he has been the victim of gamblers. His reaction is immediate, he takes lessons from professional gamblers, and avenues his opponents. In the end, he also wins the beautiful widow.