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A man goes on a rampage in a supermarket. Sarah arrives at the scene before the SEK and goes after the perpetrator, who is dressed in military uniform. Cornered by Sarah, he takes his own life. The only victim of the attack is IT specialist Malik Otark. Was he simply in the wrong place at the wrong time, or was he specifically targeted? The perpetrator’s trail leads to nearby army barracks.

A man whom Sarah Kohr placed in the witness protection program years ago has suddenly resurfaced. The highly agitated explosives expert appears to be planning a new job. Nils Köppke has no business being in Hamburg - not since he testified against his brother, Sven, who subsequently swore revenge. The explosive "Köppke method" once earned the brothers suitcases full of gold and jewels, before Nils decided to walk away. In the years since, the former key witness had built a legitimate life for himself, well-protected and far away. He was living a happy life and had recently fallen in love.

During protests against a groundwater drilling project, a demonstrator dies. The blame falls on a young police officer named Jule - and footage from her bodycam appears to be conclusive. But Sarah Kohr isn’t convinced. In Blankenfleet, near Hamburg, a citizens' action group, the local municipality, and the beverage corporation Aqualis find themselves at odds, while outside agitators arrive to stoke the tensions. During the next demonstration, Sarah embeds herself among the police officers to conduct an investigation. Just as the commanding officer, Till Ruprecht, had predicted, the situation escalates once again. As she digs into the events, Sarah uncovers a web of lies and commercial interests.

Sarah throws herself into the search for Levan, a severely injured worker who has gone missing and is at risk of bleeding to death. Levan’s sister, Natalia, is also prepared to take desperate measures to save her brother - with the help of a young cook named Lena Althoff. Levan and Natalia had been staying at the guesthouse run by Lena’s stepfather while working for shipyard owner Naujoks - performing the kind of grueling labor that few Germans are willing to take on. Sarah uncovers a system of exploitation and intimidation that has already cost many lives. Yet, temporary employment agency owner Mira Röver confidently defends her business model, which appears entirely legal on the surface. Her unscrupulous partner, Marten Schulz, however, speaks a very different language. Sarah finds herself fighting not only for her own life but for the lives of several others - and then, her mother, Heike, also ends up in danger.