Andrzej Wajda's 1958 masterpiece Ashes and Diamonds was a really terrific time at the movies. It stars "The James Dean of Poland" Zbigniew Cybulski as Maciek, an assassin at the end of WWII tasked with taking out communist leaders in Poland, alongside his friend/mentor/superior officer Andrzej (Adam Pawlikowski). However, Maciek soon falls for the sexy barmaid Krystyna (Ewa Krzyżewska) at the hotel in which they are staying. The man they're supposed to kill is staying there too, and there are a lot of close calls as Maciek and Andrzej try to figure out how to assassinate this man, or if with all the killing done in the war if it is even worth it (in this way it's very much a precursor to Spielberg's brilliant Munich).
Shot like the noir films that had lost their popularity at the time, but with a realism in acting and setting that really grounds everything as much as possible. It's a beautiful movie to look at, one that Martin Scorsese has listed as one of his 10 favorites ever made. I would and will watch this masterpiece again over the years, as there really isn't a single weakness in it. It's a pretty perfect movie.