The body of John Staffler, a well-known, successful lawyer, lies in front of the police officers. In his mouth: a red thong that definitely doesn't belong to his wife. At least that's what the former Hamburg criminalist Viola Delbrück and the Upper Lusatian loner Burkhard Schulz agree on. And also in the fact that the place where the body was found is not the crime scene. The investigation leads them to a country estate where Staffler apparently housed his lover. The trail continues to lead them to a young Polish-German couple, whose escape becomes more and more desperate the closer the two inspectors get to them.

A month has passed since "Butsch", the loner from Oberlausitz, and Viola Delbrück, the detective from Hamburg, stopped a young criminal couple. Despite this success, the mood between the detectives is worse than ever. But right now they are in demand as a team, because a serial offender seems to be on the loose in Görlitz, targeting young, attractive female joggers. However, Viola Delbrück's biggest problem is not "Butsch", but her husband, who is trying to settle into his wife's new life - also professionally. But "Butsch" senses danger and trusts his own instincts.

Ever since she helped him arrest his archenemy Goran Tonka, "Butsch" has felt responsible for Sandra. Now her roommate is found dead. Killed in a deep cauldron of the old Görlitz yeast factory. What's worrying is that the dead woman is wearing Sandra's jacket and for days she hasn't just been being watched, she's felt threatened. Is Goran Tonka on a vendetta and accidentally caught the wrong woman?

A dead biology graduate, a billionaire investor, a mysterious house and a rare beetle keep detectives Burkhard "Butsch" Schulz and Viola Delbrück busy this time as they finally investigate side by side again.