Run A Crooked Mile (1969)

IMDB.com:

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Inquisitive, unflagging schoolmaster in London chases down the driver of a car which ran him off the road to a secluded manor in the woods; sneaking in the back window, the teacher comes across a secret sect of gentleman bankers who appear to be unaware of his presence when a shooting occurs. Complicated, endlessly intriguing film from Universal was distributed straight to television, though it has the look and feel of a theatrical feature (and may have eventually been pared down to TV-movie length, unfortunately). There simply isn't enough time on the clock to expand on all the twists and turns in Trevor Wallace's script. This would make the perfect mini-series, as each unfolding episode holds a small surprise. Louis Jourdan is terrific in the leading role--smart, sure-handed, resourceful. Mary Tyler Moore plays his romantic interest who may or may not be what she seems, and she's well-matched with Jourdan (but why can't the women in these movies ever run from Point A to Point B without falling down?). The concluding events seem a bit rushed, and Jourdan's escape from a locked room near the climax is right out of James Bond. Still, the film is a good one; improbable, perhaps, but tightly-paced, intelligent, and highly enjoyable.

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Technical note: Quality is uneven but this is a very difficult movie to find so I decided to post it anyway.