There are only three major characters and most of the action takes place indoor. Although there are many scenes where two characters would just talk and talk, it never ever gets boring. In fact all the conversations are quite interesting. For some reason the author decided to write two climaxes, both of which seemed odd to me. The second one is weird as hell.
I am a big fan of dark thrillers and "Mercure" seems like the perfect source material for an atmospheric, period thriller. I couldn't help but imagine a smart tall brunette like Angelina Jolie playing Françoise. By amping up the supernatural elements and adding some scares this could be one hell of a movie ! Wow! I wish that gets made.