Shortly after Soviet tanks crush the 1956 Hungarian uprising, adventurer for hire Mike Reynolds (Richard Widmark) goes to communist Budapest to rescue one of the revolt's leaders, Professor Jansci. There's just one big problem; the professor doesn't want to go. While the plot is minimal, this simple actioner conveyed the dark atmosphere of Cold-War Hungary very well -- and it gave American audiences their first look at a ravishing young Senta Berger.
~ Michael P. Rogers, All Movie Guide