Once the valet leaves, M. Noirtier locks all the doors in the room.
Villefort asks his father if he knows anything about the Bonapartist club on the Rue Saint-Jacques; of course, he replies, I'm the vice president.
Villefort and his father discuss the matter of General Quesnel, spending a lot of time discussing the nature of "murder" in general. Noirtier tells him that the General had been invited to the club under the assumption he was a Bonaparte sympathizer; still, he swore to keep the plan secret. He must, Noirtier continue, have taken a wrong turn somewhere and ended up in the Seine. He assures his son that there's nothing anyone can do to stop Napoleon, then turns to leave.
Villefort stops him and tells him that the police have a description of the supposed murderer.
With surprising quickness, Noirtier gives himself a shave and dresses himself in his son's clothing.
Noirtier thanks Villefort for saving his life – he's serious – and promises to return the favor. He tells his son to give the king the straight dope on what's happening with Napoleon – in the end, his honesty will help him regain the monarchy's favor, should it be restored. He also assures him that he, Villefort, will get to keep his job in Marseille.
And then he's gone.
Villefort watches from the windows as he runs from the hotel, then gets to work disposing of his father's old clothing. Soon enough he's back in Marseille.