Raw Fish Gaoshun enlists Maomao's help in investigating a case involving a bureaucrat who falls into a coma after consuming raw fugu seasoned with vinegar, similar to an incident ten years ago. Every detail checks out, save for one, leading her to Gaoshun referring him to a man named Basen, who shows her the kitchen where the food was prepared. Despite interference from the bureaucrat's younger brother, Maomao finds the detail that interested her: the seaweed used in the dish, which was imported from the south...