Undercurrent doesn't have a reputation to speak of. Hardly anyone's seen it, and those that have tend to think it's a bit rubbish. I enjoyed it, though, for a couple of reasons.
Firstly, it's essentially entertaining: you can see where the story's going ahead of time, and it's certainly strung out a bit, but it's enjoyably devised, well-handled by Minnelli, and well played by a couple of screen legends.
Because, secondly and most importantly, it's one of those "wouldn't it be great..." films. In this case: "wouldn't it be great if Bob Mitchum and Kate Hepburn made a film together?" Two actors that it's hard to believe ever inhabited the same world, let alone the same film. There were so…