The next morning, Baldini goes to Grimal, pays for the goat leather, and invites Grimal to share wine and negotiate Baldini's purchase of Grenouille as an apprentice. He offers an enormous sum of money and Grimal accepts. When they return to the tannery, Grenouille is waiting with his clothes, and he and Baldini leave.
Grenouille's tick-like "knowing" is evident here, as he was never told that he was going to work for Baldini for sure. We also see Grenouille being treated like a slave or animal once again, as he is “sold” from one master to another—a fact that perhaps contributes to his conception of himself as something other-than-human.
Grimal, convinced he's just made the best deal of his life, continues drinking throughout the day. That night, confused, he falls face first into the river and drowns instantly. The river draws his body downstream.
This asks the reader to recall what happened to Madame Gaillard, who also died a horrific death after breaking off contact with Grenouille. Grenouille’s very presence seems to bring bad fortune and even death.
As Grimal's body flows under the Pont-au-Change, Grenouille is going to bed in a bunk in a corner of Baldini's laboratory. As Grenouille falls asleep, he dreams of a victorious entrance into his inner fortress where there's a banquet and an orgy with clouds of incense and myrrh held in his honor.
Grenouille's celebration in his inner fortress indicates just how important this move will be for him. Notice the specific mention of an orgy; this will be a recurring motif throughout the novel, adding to the overall sense of decadence, sin, and the grotesque.