"The CBS Radio Mystery Theater" has been criticized for having plodding plots as a result of attempting to present hour-long programs in a medium designed for half-hour programs.  The opposite would seem to be true in this episode.  In fact, the show seemed a bit rushed as a result of trying to cram the whole book into just one hour.  (Incidentally, the book itself is rather plodding.)  I've taken the tour of the House of Seven Gables (it is a real house) in Salem.  Ghost story.