Zoran, 12-year-old son of divorced parents, lives in a skyscraper, but the drabness of urban living is somewhat improved by the proximity of a hippodrome and a horse farm. Zoran's favorite horse is a former champion named Zimzelen (Evergreen), a stud whom the administration decides to sell to the slaughterhouse. After an unsuccessful attempt to change their minds, Zoran and his friends steal the horse and disappear. After realizing what this horse means to the children, they give it to the class as a gift.