Egon Brümmer and his half-strong "boys" are an integral part of the Borkenheide Musical Club. When the manager of the clubhouse forbids them to rehearse in his rooms, Egon and his friend Paul react by hitting on the visitors to a nearby Christmas party. Both are sentenced to six months in prison without parole for assault. When Egon gets out of prison, he wants to leave his old life behind him. He tries to avoid the boys, but they don't understand his change of heart. He starts working as an unskilled laborer on a building site, just as he did before he went to prison. At a graduation ball, Egon meets Christine Lange, who wants to study medicine. Her friends call her the "eighth wonder of the world" because it would be a miracle if she were to fall in love. Egon pretends to be a construction specialist and the two dance together.