Evidence(1964)

Original title: Ha egyszer 20 év múlva...

Péter is determined to learn the whole truth about his father's death. According to his mother, he was killed on the battle-line on the 2nd of December, 1944. However, a friend of his father's, Kánitz, a film director, shows him a fragment of a film in which he can be seen in the middle of December.