Next week, I'm beginning to read "The Question of God" by Armand Nicholi. The book is a series of fictional conversations between CS Lews and Sigmund Freud.
Armand M. Nicholi Jr. is a Harvard Medical School psychiatry professor. The novel discusses the difficult and painful relationships that both Freud and Lewis suffered and how their experiences in life might have shaped their concept of God. Both, having survived World War I, were said to suffer PTSD for the rest of their lives. The book takes place shorter after Freud was diagnosed with cancer, but before he took his own life and before Lewis adopted children who were war orphans that became models for the children in the Narnia series of books.
The book was interpreted as a play by Mark St. Germain, which in turn was made into a film directed by Matthew Brown, starring Anthony Hopkins as Freud and Matthew Goode as Lewis. Hopkins played Lewis in the 1993 film, "Shadowlands."