Ten-year-old Ole is full of mischief. He attempts to fly and is hospitalized with a broken leg. When he sees a Sherlock Holmes movie on TV, however, he forgets about the pains and comes up with a new plan. Disguised as Sherlock Holmes and Dr. Watson, he and his friend Andreas start searching for criminals. Soon, the two boys detect their first case. On the street they meet a man wearing a stuck-on beard. The hobby detectives find this very suspicious and decide to follow him.

Married couple Peter and Felicitas Kallweit are facing an extraordinary marital test: at the same time, the purchase of a new, more prestigious car and a trip abroad seem possible. They have to make a choice between the two.

Four years have passed since Alma and Dr. Kröpelin got married. The home zoo in Groß-Klückow is thriving and Alma is completely absorbed in her new role. But she still finds time to take care of things that, strictly speaking, are none of her business.

Alma Krause is the proud owner of a thoroughbred French bully. Even otherwise, she nurses and harbors several two- and four-legged friends in her apartment - just as one would expect from a veterinarian's widow. Her nephew Heinz, on the other hand, is kind of beaten. Not as for the love of animals, that would fit badly to a nascent vet, but for a small animal practice, as the blessed uncle operated, he seems to have no ambitions. A future as a "Bazillenscheuche" in the cowshed would like to spare him again Aunt Alma. And she takes her appropriate action.

Shortly before his retirement, Gustav Wanzka wants to return to his beloved profession as a teacher after years of working as a district school inspector. As soon as he arrives at the station, he meets the boy Norbert Kniep, his future pupil, who clearly surprises him with his questions. He wants to encourage the pupil, who is considered uncomfortable to the teachers but is very gifted in mathematics. With his highly personal views on educational goals, Wanzka stands in stark contrast to his teaching staff. Any innovations and even positive conflicts are nipped in the bud, and thus the pupils are ultimately educated to mediocrity.

Martina and Jürgen are lovers in the GDR. She is studying economics in Leipzig, he is preparing for his master's examination as a violin maker in Altneukirchen in Vogtland. While Martina deals with problems of modern science and technology in her thesis, Jürgen is committed to the traditions of instrument making. This leads to friction and strains the relationship. And when Martina meets her former childhood friend Peter Struck in Altneukirchen, the center of musical instrument making in the GDR, who works here as a physicist at the research institute, jealousy also comes into play.

804, Thuringia. An orphan boy, called Bengel, lives in a monastery and is teased by the nuns because of his ugliness. He nurses a black rider, who is shunned by everyone and is said to have the plague, back to health. The rider tells him about the missing Bogumil, son of the Slavic king Slavomir, who was to marry Reglindis, the daughter of the Margrave of Thuringia, by order of Charlemagne. And he asks Bengel about his origins. Bengel now believes he is Bogumil. He goes to the castle and meets a beautiful girl who also thinks he is beautiful. It is Reglindis, she is blind. The girl senses the boy's inner beauty and is very fond of him. Her father, however, wants to kill him. Bengel narrowly escapes death twice, the Black Rider impressively proves his identity with Bogumil and finally there is a happy ending.