This film is now 45 years old, but still stands up as a massive achievement.
I won't ruin the plot, but an army platoon's disappearance behind enemy lines in the Korean War leads to an award for their Staff Sargeant, whose stepfather just happens to be a rabid right-wing senator. It isn't the correctness of the honour's bestowal that needs to concern you, either!
The film is lit up by Frank Sinatra, as the platoon's Major, who slowly realises something evil happened, but he can't guess what, let alone why for ages. Sinatra's face in this film is expessive beyond belief-starting like a guy with a pebble in his shoe,and mildly irritated, it gradually collapses as the enormity of what might have happened sinks in, especially when he's left alone to try and reverse the seemingly inevitable conclusion.
Laurence Harvey, as the Staff Sargeant, is perfect casting-he often acted with hardly-supressed boredom and a stony expression & that suits the man he has become. But glimpses of what he actually was break through now and again, and the question boils down to which part will do what in the climax of the film.
As if that wasn't enough, Angela Lansbury, as Harvey's manipulative mother, puts in a third cracking performance. How she got to be Miss Marple after this is beyond belief-very naughty girl indeed!!
So, that's more than enough reasons to buy it-go get that credit card now!