Summary When a yacht moors to his sailing boat, it's normal for Nils. A friend from Ruben Lohmann's gang must be on board. But a blow from the sail boom sweeps Nils off the deck into Lake Constance... Paul Schott first discovers the rudderless sailing boat and then the young man floating dead next to the boat. Ruben and his girlfriend Solveig and their friend Marcel are happily living their days and giving each other alibis when the police find them in their bathing bay. Jakob Frings doesn't trust the peace and offers Nele to investigate undercover in the gang. But Nele doesn't want to hear anything about it. She has no idea that Jakob is now gaining the trust of Ruben and Co in his free time and thus gaining completely new insights into the group dynamics of the gang. Somehow the three of them seem to be spying on each other and suddenly Marcel disappears. First he can no longer be found, then a collection of watches belonging to Rubens' rich father appears on the Internet and finally all the evidence points to Marcel, who could never afford as much as Ruben. When Jakob tells Nele about his unauthorized investigations, she immediately takes him off the case. Jakob continues on his own. With fatal consequences. Ruben, who now distrusts his girlfriend Solveig, makes a fateful decision. Jakob's life is in danger.

• Crime