Germain Vignon is a used car dealer whose eloquence is such that he could sell the lousiest banger to a guy that does not even have a driver's license. He is not bad either at chatting up girls. Indeed, since his blonde wife left him, Germain has seduced no fewer than four brunettes. And as, besides being a ladies'man, he has a heart of gold, Germain is unable to break up with any of them, hence a complicated sentimental life. But this delicate balance is threatened the day an outraged stranger ...