From The Perry Mason TV Show Book (Revised)
Physicist Hans Ritter has been contacted by the Soviet Union and told that his six-year-old granddaughter is living in an East Berlin orphanage. If he’ll return to East Germany and work for the Communists, little Elke will be released to Ritter’s wife.

Perry agrees to negotiate for the scientist, but Ritter is overanxious and goes on ahead. Perry, Della, and Paul catch up with Ritter and get involved in a murder case behind the Iron Curtain. Now Perry has to defend Ritter’s wife before an East German court, where the Communists don’t play fair.

Berlin looks suspiciously much like L.A. in this episode. Note that just about every car shown is either a Mercedes-Benz or a Volkswagen Beetle.