El Doctor Fischer De Ginebra

From the cover:

Following on the enormous success and critical acclaim of Graham Greene's last novel, The Human Factor , comes Doctor Fischer of Geneva , a black entertainment which is also a profound study in human greed.

At the center of this remarkable tour de force is the enigmatic Dr. Fischer, millionaire, student of human nature, practical joker and party-giver. His parties are famous -- or perhaps notorious -- for they are part of his experiement to see just how far even (or especially) the very, very rich will go to satisfy their greed, a Grand Guignol entertainment observed by Dr. Fischer's guests risk not only humiliation at his hands, but deaths.