Mr. Hu, the owner of the "Mandarin" restaurant, finds his dead son in the restaurant's basement. Jörn Fleischer becomes a suspect in the murder. He is the manager of the "Hummer" restaurant, which is on the verge of closing. Ever since the cheap Chinese restaurant opened, Fleischer has been losing more and more customers. But Inken Blume is also a suspect. The overzealous animal rights activist is determined to avenge the death of her loyal cat, "Herr Storm," by any means necessary. She even mobilizes the health department against the Chinese restaurant, which she claims is slaughtering cats. Jon and Nora skillfully separate the wheat from the chaff.

What do a missing Dutch shrimp vendor and a dead young barber have in common? At first glance, it seems that Nora and Jon are dealing with two unrelated cases. But soon, the first connections become apparent: Fatima, the colleague and lover of the deceased Mirko Jensen, becomes the focus of the investigation. Does she have anything to do with the Dutchman's disappearance? And what do the barber's last words—"Tidenhub" and "twelve past four"—mean?