Durante el transcurso de un día numerosas vidas se cruzan entre ellas. La noche se convertirá, para los involucrados, en algo que nunca olvidarán, una noche en la que las coincidencias cambiarán a algunos la vida para siempre... (FILMAFFINITY)
The film is based on a series of immensely popular Swedish children's books, about the boy Bert, who is just hitting puberty and having the usual problems with it. But that's where the usual ends abruptly.
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.