In a small village in Västergötland, everything is turned upside-down when the local loner dies and his cottage is inherited by his unknown relative Fanny. She rides into town on a big black motorcycle with her androgynous boyfriend Zack, wearing black leather and spikes. When they decide to stay, Flogfält's plans to buy the cottage are upset.
The ten year old Nisse suffers from acute asthma and is rushed to the hospital. There he meets Lelle who is a bitter, lonely and seriously ill twelve-year-old. Lelle, who never gets any visits treats Nisse kindly. Lelle inaugurates Nisse in his secret plan to build a giant Zeppelin and steal the food available in the hospital's underground reserves.