When a baby is left on their doorstep, hard-partying bachelors Pierre (Roland Giraud), Jacques (André Dussolier) and Michel (Michel Boujenah) experience a serious lifestyle change. Instead of carousing until dawn and chasing women, they're now changing diapers and learning the ins and outs of fatherhood. The baby's mother -- one of Jacques' many conquests -- has flown to the United States. In the meantime, they'll have to protect the child from a mix-up with some drug runners.