Borowski goes undercover, placing a personal ad to bait a killer who seems to find victims through a lonely hearts site.

A gruesome sexual murder shocks Münster. The victim, a young law student, was found strangled in her apartment. “Do we all have to be afraid now?” is the headline in the local press. But there is not much to suggest that a serial killer was actually at work here.

However, the victim's ex-boyfriend André Pütz, a freelance photographer who mainly travels to crisis areas around the world, is an urgent suspect. Recently he had repeatedly stalked the young woman. When Inspector Thiel and Prof. Boerne surprise him at home, he flees headlong.

And yet Thiel resists drawing hasty conclusions. He discovers parallels between the crime and other cases. Above all, the extremely attractive bank employee Anna Schäfer, whose apartment was recently broken into, won't let him go. But at first he meets her very aloofly.

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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