Three young men - Jacques Pierre and Michel - share an apartment in Paris and have many girlfriends and parties. Once during a party a friend of Jacques' tells him he has a quite compromising package to deliver and asks him if he can leave it discreetly at their place. Jacques agrees and as he works as a steward flies away for a one-month trip in Japan telling Pierre and Michel about the package. Then one of Jacques' former girlfriends drops a baby before their door making Pierre and Michel believing it is the package they are waiting for. Their lives are then completely changed.