Kurt Gerstein—a member of the Institute for Hygiene of the Waffen-SS—is horrified by what he sees in the death camps. he is then shocked to learn that the process he used to purify water for his troops by using Zyklon-B, is now used to kill people in gas chambers.

Seitz has been abusing his underage daughter for years and is the father of her first child. He is a brutal perpetrator of violence and has several relevant criminal records. When Tanja confides in her new boyfriend, he persuades her to go to the police. Seitz is sentenced and threatens to beat Tanja to death while still in court. Tanja and her boyfriend have long been married and have children of their own when, after seven years, fate catches up with them again: they are terrified of Seitz, who is soon released from prison and threatens revenge. Tanja and her family turn to the authorities in vain. They can only intervene if there is a concrete threat. But then it will be too late, Tanja fears. Too late for her children and herself. Together, the family gets a rifle...