This is his film famous for being done in "one shot." Well, sort of: Because a reel of feel can only last 10 minutes, he had to stop filming when a reel would run out, though he cleverly framed things each time so that you couldn't quite tell. Usually he would do something like pan the camera to an actor's back and make the cut there.
Jimmy Stewart, who stars, says that you can probably tell when a 10-minute reel would almost be up, because the actors would start to panic, out of fear of screwing up at the last minute.
Stewart plays a college professor in the story, which is loosely inspired by the Leopold and Loeb case, defended by Clarence Darrow -- who as whimsy would have it is the subject of the play written by our Email Interviewee