Can such a thing be done? Are there demons here? Would they take my soul? They can have it; it is no good to me anyhow.

[And it's about the only thing she has left to sell.]
How much would it be?

M'sieur, it is not blackmail. Or... Maybe it is, but it is not bad. Worse things could be done. If Madame were in France, she'd be dead already and be left with nothing now.