Hubert and Staller find the body of pool cleaner Markus Greben in the swimming pool belonging to nightclub owner Bert Joschek. Was it an accident—or even murder? That's what medical examiner Dr. Anja Licht must first determine. Meanwhile, Hubert and Staller begin their investigation, which proves more difficult than expected. After falling into the pool—which had a dangerously high chlorine level—and receiving botched first aid from the hostess, Sandra Joschek, Hubert has temporarily lost his sight. With an opaque eye patch, he is now helplessly at the mercy of the caring Staller. Bert and Sandra Joschek very soon emerge as the prime suspects in the murder case.