The city of Kiel goes on lockdown after a sniper shoots a man on the Hörn Bridge.

Cenk Batu is investigating undercover in the Hamburg Special Operations Command (SEK) on behalf of his superior Uwe Kohnau. Some officials there are suspected of working illegally as trainers abroad and selling their specialist knowledge. Batu manages to gain the trust of SEK man Lars Jansen, who is also said to be involved in the deal. The case seems almost solved when the SEK is suddenly called because of an alleged hostage situation.

A dead body is caught in the net of a German fishing boat off the Norwegian coast. But the dead man seems to be the second officer of the container ship MS Karina, Radek Jankowski, and he is apparently not missing. To Inga Lürsen and Stedefreund's astonishment, neither the water police nor the shipping company in Bremerhaven are willing to help.

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A wedding party puts detectives Lursen and Stedefreund at the center of their next investigation.

Lürsen and Stedefreund embark on a controversial murder investigation.

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Things get out of control after two police officers receive an emergency call on their nightly patrol.

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A case involving a missing seven-year-old resurfaces ten years later.

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A mentally-ill locksmith thinks he's receiving messages directing him to procure victims.

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Robert discovers he's been living next door to a decaying corpse.