The music professor Christian Lerch was murdered. He leaves behind a bewildered widow with fertility problems. The couple was on the verge of adopting a child. The first suspicion is murder out of jealousy because Lerch had an affair.

The Hen Night of four old friends ends in a disaster. Jessica, the young bride-to-be, died after she drank her last nightcap at the hotel. The suspicion is confirmed: Jessica was poisoned.

Two BKA investigators died in a mysterious car accident. The investigators Jan Maybach and Ina Zimmermann ascertain undercover as a supposed couple and discover deadly intrigues of a software company.

The investigators Ina Zimmermann and Jan Maybach are undercover in operation to protect the whistle-blower David Bartz. With his help a big safety scandal could be discovered, but someone tries to prevent.

At the station, a suitcase was stolen with human stem cells which should be transplanted urgently the leukemic Elias Bermann. Shortly thereafter appears a blackmail letter. The thief demands 1.5 million euros for issue of the suitcase.

In Dresden a SEK-man was shot with a sniper rifle. There are indications that the killer comes from its own ranks. Jan Maybach and Ina Zimmermann determine as external investigators on the case and reveal systematically the conspiring SEK-troupe.

Dana Schröder gives birth to a baby while intoxicated. Shortly after birth, she disappears from the hospital to get new Chrystal Meth. The next morning she was dead. Suffocated with a pillow in the apartment of her best friend Melanie Lottmann.

Near a refugee hostel the Iraqi Bassam Alaya was stabbed. Around the accommodation, there was unrest for weeks already. Right-wing extremist groups consist for a closure of the accommodation. It would also be possible that Alaya was killed by a roommate.

When Sarah and Henry Walser came home after a party at night, they made a terrible discovery: their eight-year-old daughter Viktoria was kidnapped. Suspect is Ronny Lewek, a convicted pedophile, who works despite ban as a gardener at Viktoria's school.

After work investigator Ina Zimmermann finds in the stairwell of the police station a murdered colleague. The offender must still be in the building. Therefore, they close off the police station and starts with the investigation.

During an attack on a filling station the employee is shot and one of the perpetrators seriously injured. The perpetrators can escape and kidnap an ambulance. In this ambulance is the son of the investigator Jan Maybach, who trained as a paramedic.

One of the inhabitants of the residential building known as "horror house" was found murdered in the courtyard. The owner wanted to renovate the house, but the residents refused to leave the house.

The case of a dead youth leads the investigators into the municipal policy. There is disagreement about what support is good for street kids and young criminals. Social pedagogue Ralf Meineke contends for recognition of secondary prevention.

In a truck, investigators find four dead refugees while a few survived. Philipp Glaser, the driver of the truck is on the run and after his arrest claims to have known nothing about it. While Prof. Rossi detects that the refugees were poisoned with antifreeze.

When Dagmar Schnee finds out that the woman from their old friend Ullmann will die as soon, she helps him with a problem. She descries a woman unofficially. But this woman disappeared and her trail leads in a hotel where a suitor was murdered and robbed.

In the channel system of the city drives the body of the professional canoeist Ansgar Armbruster. His ten year old son Linus is also a professional canoeist. Because of the sport Ansgars wife Nina had lost the relationship to her son Linus.

The isolated pensioner Karl Rosenberg was found dead in his apartment. He was probably the victim of gentrification, because he was the last inhabitant of a run-down tenement house and the house administration wanted to get rid of him.

Theatrical actress Hannah Falck and political adviser Ralf Möller had an affair. After a violent argument Hannah disappeared without a trace. When Hannah was found dead on a resting place, Möller have to go to the investigative custody.

A pensioner, who received a Syrian refugee with his wife Nora, was murdered in front of his church. Leipzig's Islamic opponents are alarmed. They demand a harder attack against terror. Hatred, fears, and prejudices characterize this case.

The coach of the American football youth team, Jörn Bellhoff, was found dead on the field. Apparently, he died through a particularly brutal tackle attack. His whole body is covered with hematomas.

In a modern research laboratory, the head of the Institute of Artificial Intelligence was killed by an industrial robot. Lorenz Rettig is ordered to the crime scene to clarify whether the robot has made itself independent or manipulated by humans.

The pensioner Bodo Stoltz was found dead in his apartment. The man, who was suffering from severe depressions, longed for death. But there is the suspicion that someone has helped him. His daughter Annika Olbrich admits to having barely suffered the illness of her father, but had not killed him.

The corpse of Tanja Wolf was found in hospital wastes. A trace leads to the laboratory of the clinic in which artificial tissue is being researched. Before her death Tanja and her husband protested against the ethically questionable plans.

Lara Seidel, a young journalist, was found dead. Already on the eve, she was reported missing by her friend, Johannes Breuer. A first track leads the investigators to a hostel. Tom's daughter Jackie takes a job at this hostel.

Numerous fatal injuries characterize the corpse of the brothel leader Marco Kovac. The investigators believe that he was a victim in gang warfare within the milieus. Presumably it was about the redistribution of the market, because red-light boss Harro Bender is again on the loose.

Leah Cohen, an Israeli journalist, who detects the perpetrators of the SS and Wehrmacht and brings them to justice, disappears on a visit to Germany. With a false identity she wanted to attend a meeting of neo-Nazis in Saxony, where a former high-ranking SS-man was to appear.