Dekalog, osiem (1989)

Thou shalt not bear false witness against thy neighbour.

Zofia, a professor of ethics, is visited by Elżbieta, an American researching the fate of Jews who survived World War II. A daytime classroom conversation turns into a night of confrontation, and Zofia is forced to answer for a decision she made decades ago that directly affected the course of Elżbieta’s life.