Cynical and vulgar, Isidore Lechat is a nouveau riche who hides his extraordinary capacity to rob his victims behind the silver tongue of a bon vivant and disarms them. Nevertheless, he is totally blind in his private life; he does not realize that his wife is lost and unhappy, his beloved son Xavier is a slacker, his daughter Germaine is disgusted and is having love affair right in front of him. He also does not notice that Germaine prepares to flee his golden chains, rejecting Lechat's dreams of a good marriage.
Furthermore, the libido dominandi of Lechat is powerless over love and death: his son dies in an automobile accident, and her daughter goes away with her lover, Lucien Garraud. In addition, his formerly submissive wife becomes no longer afraid of him and judges him severely. Defeated, oppressed and humiliated, Lechat finds the strength to recover his self-control in order to seal a profitable deal, crushing the two swindlers who wanted to take advantage of his grief and fool him: business is business...
In spite of the disgust inspired by his cynicism and vulgarity, Isidore Lechat can also rouse a kind of admiration for his energy and his clearness in business, and even inspire pity when he loses his daughter, his son and his submissive wife in a single day.