Clément Mathieu: [they've found the stolen money and a harmonica] You know Mondain was expelled because they thought he'd stolen the money.
Corbin: No, sir.
Clément Mathieu: No, that's right you didn't. But now I've told you. So what were you going to do with this money?
Corbin: If I tell you, do you promise not to tell anyone?
Clément Mathieu: Promise.
Corbin: I was going to use it to buy...
Clément Mathieu: To buy what?
Corbin: My Montgolfier balloon.