Ten stars from all walks of life appear in oversized, elaborate costumes that make them completely unrecognizable. One can only speculate about the identity of the prominent undercover singers. Viewers vote for their favourites. At the end of the show, the secret is revealed for the masked celebrity with the fewest votes: Which star is hiding under the mask?
The meat manufacturer Thomas Heitbrink (Michael Schiller) is accused of poor hygiene in the company. His lawyer Dr. Tessa Tilker (Patricia Meeden) tasks Wilsberg (Leonard Lansink) with finding out who wants to harm the company. Wilsberg discovers that Heitbrink's daughter Lea (Anna Hausburg) has reason to slander her father. As a convinced vegan, she is in a permanent ideological clinch with her father. Does the burglary in Lea's apartment, which she shares with Jasmin Rudolph (Jaëla Probst), have anything to do with the case?
The always distracted fish lady Dory lives with Nemo and Merlin in the coral reef. Suddenly she remembers that she is actually looking for her parents. So the three set off together. But Dorie's forgetfulness leads her down hilarious detours.
Abbie Campbell (Luisa-Céline Gaffron) is in prison for murder, she stabbed her sleeping husband. The background to the brutal act was never clarified, Abbie had refused any statement at the time. Criminal psychologist Cathrin Blake (Désirée Nosbusch), who has to prepare an expert opinion on the young woman, is convinced that Abbie was in an exceptional situation at the time and that she no longer poses a threat today. Cathrin manages to secure parole for the convicted murderer so Abbie can see her baby daughter Maisie (Molly McCann) again. During the visit, disaster strikes: Abbie flees with Maisie.