London, September 3rd, 1939. The world is on the brink of war.  In his final days, Sigmund Freud (Anthony Hopkins), a recent escapee with his daughter from the Nazi regime, receives a visit from the formidable Oxford Don, author C.S. Lewis (Matthew Goode).  On this day, two of the greatest minds of the twentieth century intimately engage in a monumental session over the belief in the future of mankind and the existence of God.