While browsing through the Internet Archive, I came upon a 1960 tv production of The Bat. Produced for the Dow Hour of Great Mysteries series, this 1960 kinescope features Helen Hayes, Margaret Hamilton, and Jason Robards Jr. It's not the most suspenseful story any longer, but it's made delightful by The performances of Miss Hayes and the rest of the cast.
http://archive.org/details/TheBat1960
A pleasant way to spend 50 minutes of your time.