Poirot's advice on how to tell if you and your partner are compatible
Hi, I'm new to this forum, and am not sure if I'm posting this question in the right place, so apologies if I'm not!
I am trying to find the title of the book where Poirot (I think it was Poirot) talks about a way in which one can test whether we are compatible with a partner. The one test I remember clearly was whether you prefer to sleep with the window open, or the window closed?
I have tried Google for days now but I just cannot remember which book it was! Hopefully one of you will know!