One evening, a group of high school graduates gather on their school playground, they talk, play games and drink alcohol. Feeling bored, they decide to break in the school. Stories of the creepy janitor scare the girls but the boys manage to persuade them. What started as innocent fun ends in a bloodbath when one of the students turns the night into a horror movie.

Set amid the atrocities of war in the Balkans, Witnesses is retold, Rashomon-style, from various characters' viewpoints, adding new information about the complexity of war and humanity. Beginning inside a rustic house with a woman in black (Mirjana Karanovic) standing beside her husband's coffin, Witnesses interweaves the stories of a small town confronting ethnic hatred and deep moral ambiguities.