Is Madame Kathy's 'original'?
Kathy searches for her original in a porn magazine, but she never finds her. I was expecting her original to be presented somewhere in the story, even in a subtle way. Could Madame Marie-Claude, the art gallery-owner, be the one? She is the only one who actually looks like Kathy. Same height, similar face and hair.
If so, it would give an explanation to why she was interested in knowing if they had souls. Also her behavior hints that she has a special relation to Kathy. In the book, she cries when she sees Kathy listening to Never Let Me Go by her lonesome. But the most distinct hint is shown in one of the last scenes where Madame strokes Kathy's cheek.
What do you think?