Summary What began as a romantic trip to Mainau ended in disaster for Christine Keppler and Matthias Bruhns. Within minutes, their pedal boat filled with water. The physically weakened Bruhns found the walk to the shore too far. Before Paul arrived with the Bodan and could pull Bruhns' completely distraught companion out of the lake, he ran out of energy. When divers discovered drill holes below the waterline in the boat, the police questioned the boat rental agent Jana Gollinger, who was shocked and immediately suspected her former employee Peter Wermke of stealing from her. In fact, the back door of the boathouse had been broken open and the drill was missing. But Wermke, who makes a living as a bottle collector, vehemently denies the crime. Nele looked to Christine Keppler for the motive, who is married and had a fling with the former plastic surgeon Bruhns while at the spa. Her husband Oliver served with the KSK special commando in Calw. Jakob has airplanes in his stomach. His great love Sonja (Lily Menke), whom he left nine years ago, is suddenly standing in front of him again. She has a sweet eight-year-old daughter Tammi and a big request... While drinking coffee in front of Mechthild's villa, the two become closer - much to Julia's displeasure. Meanwhile, a letter has landed in Jana's mailbox that is very incriminating for Wermke. And Christine's husband has turned up. He wants to support his wife. Nevertheless, Nele notices atmospheric disturbances between the two. She checks Keppler's alibi.

• Crime