What starts out as a "normal" murder investigation continues to spread: the shopaholic Magnus Rosponi is found dead in his apartment. But neither his happy bowling friends nor Silke Haller, who recognizes a youth heartthrob in the dead man, can explain why the popular man had to die. For this, Professor Boerne finds a strange, small object in the corpse. Thiel discovers amorous entanglements at the same time. And when the protection of the constitution appears in the shady characters Muster and Mann, it becomes absurd. Apparently, Thiel and Boerne stabbed a wasp's nest and even drew the attention of an assassin. But how is it all connected? And what about the little dog that loves to eat bananas?
The second case in the anniversary year: 20 years of "Tatort" from Münster - Chief Inspector Thiel and Prof. Boerne are targeted by the Office for the Protection of the Constitution. A hostage-taker seeks her life.