Wsrod Nocnej Ciszy aka Quiet is the Night (1978) EngSub 1080p

A psychological detective story about a police hunt for the murderer of young boys during the Christmas season. The police commissioner ends up tracing the clues to his own home, where he has an adolescent son with whom he has difficult relationship. Directed by Tadeusz Chmielewski Starring Tomasz Zaliwski, Piotr Lysak, Henryk Bista