No Highway in the Sky (1951)

(Some mild spoilers.) The first half of this movie is absolutely fascinating, and seems to be set up as a Hitchcockian closed-room suspense... then that suspenseful moment ends and we're in the middle of a very different movie that's far less interesting than it was at first. Not to mention it ends on possible the least ending-like note ever. However, Jimmy Stewart is worth watching all the way through. He's completely charming as a geeky, socially awkward scientist. It's not a bad movie, it's just not what it could have been. 3 stars.