I watched this today on Sky Cinema. Well written and acted with an excellent cast. Richard Widmark, Martin Balsam, Sidney Potier. Dialogue driven, no spectacular FX shots with a bleak (but totally credible) ending, that modern film studios would cak themsleves to even contemplate. No superflous love interest, no rap stars placed to boost viewing figures, with target audiences. Just plot, acting and conviction. The more I watch films made before 1977, the more I feel that Hollywoods golden age is really over and beyond resurrection.