Peter Ustinov 
The Old Man and Mr. Smith 

From the late and great Peter Ustinov comes a story full of wit, satire and insight.An increasingly decrepit God and a merely ill-tempered Satan are reconciled and attempt a mission to Earth, where their misadventures point up the comedy and tragedy of modern life, as they travel to a variety of countries in the guise of the Old Man (God) and Mr. Smith (Satan), with the FBI and Interpol in hot pursuit.