The other reviewers can explain the plot. I'm just here to let you know this was one of two guest appearances on 'Hogan's Heroes' with the lovely and talented Joyce Jameson, co-star with Vincent Price and Peter Lorre in both 'Tales of Terror' and 'The Comedy of Terrors' and a couple Clint Eastwood flics to boot.
Oh yeah, funny episode too, one of Richard Dawson's personal favorites