From The Perry Mason TV Show Book
Bruce Jason has a doppelganger, an exact double. The identity of that man is the key to this case about murder and foreign intrigue, which revolves around a struggle for possession of the supposed diary of a certain Iron Curtain dictator.
+ Winston Churchill coined the "Iron Curtain" phrase in a 1946 speech in Harry Truman's Missouri. Mike Bedard 6.1.16.

Hugh O’Brian stars in a double role, playing both Bruce Jason, the lawyer who defends Elihu Laban in a murder trial, and one of the murderers who killed two victims.