Some years ago PBS aired a one-hour, one man play about Dr. Verwoerd
  of South Africa titled "A Nagging Doubt".  I can't find a single
  mention of this video on IMDB or for that matter anywhere else in the
  world.  I actually have a copy -- taped off the air -- but it's in terrible
  shape and I can barely see or hear it.
   
  Does anyone have any idea where I might be able to replace it?  Or
provide any further information about this performance?  This is NOT a
documentary -- this is a one-man show.