I've suggested to both of them to meet at Le Jules Verne restaurant, inside the Eiffel Tower. That would be sooo epic...
And I've also asked both of them to describe their attire, as per Poirot's conditions.And now that the therapist has called a "detective from Europe", which is probably one of them, it would be fitting for both of them to return to USA together.
Let's hope for a desired conclusion.
EDIT: And, BTW, Don Quixote is now reading books about both of them. My guess is that the reunion will eventually become even more grand.