No cell phone, no papers, no clothes: a naked male corpse is found in a moorland area. Thanks to Prof. Boerne's instinct, the identity of the young man is quickly clarified: It is Maik Koslowski: vegetable farmer, nude model and advocate of free love. He was also the leader of group seminars such as "Sexuality and Tantra" or "Drumming and Ecstasy". During their research on the Erlen farm with the adjoining trailer park, Thiel and Boerne encounter cackling geese, curious alpacas and confusing network of relationships. In order to bring light into the darkness, Thiel asks his "Vadder" for help: He should ask around undercover in the commune.