With the help of surveillance camera footage, the officers from the 14th precinct discover that someone rode the victim's bicycle and then got on a train. Of course, this is Elias, the young man Dirk is trying to protect.

This video gives you some insight into the services offered by one of Karlsruhe's physiotherapy practices. We explore the facilities with Paula and Dirk and get to know the staff.

Dirk Matthies is still puzzled as to where Elias got his cell phone number. The detectives from the homicide squad come to his office to ask about it and their conversation is not exactly amiable.

Mirko, an acquaintance of Daniel's, turns up at the police station with a question concerning a "friend of his" who has lost a gun... At the crime scene, two detectives make it clear to the other officers that they will now be taking over the investigation.

Even with high-tech running shoes, lots of people still suffer injuries. Barefoot running could be the solution! Knee, hip, and back injuries are often caused by an incorrect gait, which running shoes tend to exacerbate. So should we run barefoot like our ancestors?

Nina and Paul arrive at the scene and find a man's wristwatch near the victim, who is around the same age as Paul's daughter. She still has her wallet, but it looks as if her cell phone has gone missing.

The allure of the Feldberg Lakes with their clear, fresh water was described many years ago by the writer Hans Fallada. In the last part of this series, you can see how professional conservationists and volunteers are helping to preserve these impressive waters.

The condition of the aquatic habitat is checked at regular intervals by conservationists and some interesting discoveries have already been made. Meanwhile, the ospreys are gradually training their young to become independent.

Our heroes are back on board the ferry looking for the thieves. Just as they are about to give up, they notice some unusual behavior. Are they on the right trail?

The meadows around the Feldberg Lakes are home to an enormous variety of floral and fauna. While deer, foxes, and hares live on land, predatory and non-predatory fish can be found underwater, where the natural balance is being threatened by anglers.

A few very special insect species can be found around the Feldberg Lakes. Otters and other water creatures also live here, and the full moon seems to have a special effect on them.

Caruso has an idea: Maybe singing will help against the hiccups. The three friends are happy to give it a try.

This part is about the offspring of the various inhabitants of the Feldberg lakes. How do the parents behave after the mating season? How dangerous is life for the various species, and how do they protect themselves?

In this segment, we get to know other creatures living in the Feldberg lakes and learn who the "grandmother" is.

Nina has to move to Italy with her family and has had a hard time saying goodbye to Max and her friends. Suddenly, the Peppercorns have a pickpocket to catch.