An inventor and a small-time industrialist, Guillaume (Louis De Funes) has come up with something which will take advantage of air pollution and manages to confuse a delegation of Japanese into placing an order for 3,000 of the things. Just a few obstacles stand in the way of his delivering on the order. For one thing, he has no factory in which to make them. He decides to dedicate all the extra space in his house to building them, though perhaps he should have told his wife (Annie Girardot) first, because she seems to have been made unhappy by these developments.
~ Clarke Fountain, All Movie Guide