This film opens up with Max von Sydow running across snowy fields in his underpants. Good lord, we wonder, what's he doing out there? Isn't he freezing? Soon he cleverly figures out a way to get into a house via an upstairs window, and it becomes apparent that he knows the three people who are engaged in a disagreement in the kitchen below. We're not sure what he's up to, and as it's best you don't know a lot about the plot before watching this one, I won't say more.
The story is taut and well-told by director László Benedek, who wisely avoids extraneous detail, and there are moments of real tension. It's dark, but Benedek exercises restraint, which I liked, but which may turn off viewers seeking more explicit thrills. Trevor Howard, who you may recognize from Brief Encounter (1945) and The Third Man (1949), is strong as a detective, and the rest of the cast are all good as well. I liked the way we eventually see how von Sydow is able to do what he does, though you'll have to suspend disbelief a bit. Clever ending too.