"Guardian, there is something to celebrate! My tumor is gone! Come to my place in Fulda, I'll invite you to the circus." Magda Wächter, still a bit skeptical, accepts the invitation of her LKA boss Felix Murot, and together they visit a performance in the "Raxon" circus. In the middle of the performance, a woman in the audience stands up and screams hysterically at someone in the arena: "That's him! Don't let him escape!" The lights go out, the woman is gone, and the pianist of the circus band injures his hand in the dark. The next morning, Wächter and Murot learn that the woman has been missing since yesterday evening. Murot senses injustice, pays the circus another visit and – undercover as a pianist – manages to get hired in the circus band.
But not all circus people approve of his presence. After the injured pianist hinted in a conversation that he had made an interesting observation, he disappeared without a trace shortly afterwards. Little by little, Murot comes across a deadly secret from the past of an artist – in addition to Ulrich Tukur and Barbara Philipp, Uwe Bohm, Dorka Gryllus, Zazie de Paris, Josef Ostendorf, Jevgenij Sitochin, Norbert Heisterkamp, Albert Kitzl, Leonard Carow and Katharina also play Matz and Victoria Trauttmansdorff, and the artist Lijana Sperlich-Frank from the "Carl Busch" circus can also be seen in another role. The circus band is played by the musicians Kalle Mews, Günter Märtens and Ulrich Mayer, known as Ulrich Tukur's backing band "The Rhythm Boys". Carl-Friedrich Koschnik was behind the camera.