A naked male corpse is found in a moorland area. But identification seems difficult at first because there is no cell phone, papers or clothes. Their research leads Chief Inspector Thiele and Prof. Boerne to a polyamorous hippie commune that has settled on the Erlen farm with an adjoining trailer park. Despite cackling geese, curious alpacas and a confusing network of relationships, Prof. Boerne retains his investigating skills and can quickly clarify the identity of the young man: It is Maik Koslowski, who is known as a vegetable farmer, nude model, group seminar leader and advocate of free love. Now the only thing missing is the perpetrator. To bring light into the darkness, Thiel asks his dad, whom he only calls "Vadder", for help. He should ask around undercover in the commune. But what he have uncovered doesn't coincide with the suspicions of the investigators.