And Then There Were 44: Appointment with Death by Agatha Christie

There are mothers, and then there are MOTHERS. Mrs. Boynton
definitely belongs in the latter category, as we explore in our
latest novel, another "travelling" Christie--this one set in and
around the Holy Lands, including an extended stay in Petra (Indiana
Jones and affiliated grail hunting not included). Get out your
Freud, your Jung, and of course your little grey cells as Papa
Poirot goes deep--and we mean DEEP--into psychology to solve this
rather elegant puzzle mystery.