TKKG 215 - Crime in the Moorstein Forest

Tim, Karl, Gaby, and Klösschen are at Moorsteiner Lake for a swim when Karl receives a mysterious distress call that spreads rapidly through social media. A photo shows a gagged man who has pulled his blindfold up slightly for a quick selfie. The image is accompanied by an urgent "Help." Could this be a bad internet joke? Tim recognizes the background of the shot: it is clearly the fisherman's hut of an old acquaintance right here at Moorsteiner Lake! TKKG rush to the hut to rescue the victim and find themselves embroiled in a dangerous case whose implications they could not have anticipated...