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Nurse Niels Högel killed at least 85 patients. How did this unprecedented case come about? In this moving true-crime series, relatives of the victims, investigators, and experts share their stories.

Deaths are on the rise at Oldenburg Hospital. In 2002, Niels Högel transfers to Delmenhorst Hospital under suspicious circumstances. There, he is caught red-handed in 2005.

Following Niels Högel’s conviction in 2008, the police’s further investigative findings lay dormant in the prosecutor’s office files—until a new chief prosecutor took over the division.

It is one of the largest trials in the history of the Federal Republic of Germany, with over 120 joint plaintiffs involved. How many people did Niels Högel actually kill? What needs to be done to prevent such a series of murders from happening again?