Dietist Lina Gebauer was fatally stabbed in employer Dr. Schuster's medical practice. Stadler and Winter find she acted haughtily to colleague Xenia Stamm, especially since a diet course. Xenia points at Lina's boyfriend, nightclub DJ Florian Lex, with whom she rowed repeatedly. Dr. Schuster's smartphone contains pictures of his affair with Xenia Stamm, which Lina may have blackmailed them for. Lina Gebauer sold bio-health teas at exorbitant prices but actually mixed in cheap supermarket-tea, to buy luxury items like handbags, which become object of another crime. Marie gets confused between star pianist Impresario Claus Willenborg and tuner Schulze, expected to prepare a concert at the music academy, leading to a friendly contest of deception.
—KGF Vissers