A life-threatening heart attack confines Richard Roth to the hospital bed. There, Richard, who is in his late fifties, asks himself what will remain of him and his life. What happened to his four daughters? Do they take after him? How have they developed? His youngest daughter Nanny, who is still living with her father, gets her three other siblings to Weimar to visit their father.

Katrin and Dieter really want a new car, but don't have enough money. They therefore decide to host Aunt Mathilde's 60th birthday party and invite all their relatives, including those they haven't been in contact with for years. Because some of them are said to be swimming in money. So Katrin and Dieter hope for some support, but some of it turns out to be just a sham.

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.