空中堡垒SISANJE is a story of a young Belgrade high school math champ Novica who gets seduced into the world of skinheads by their charismatic leader Relja. Novica joins the gang of racist skinheads in an attempt to overcome the geek status in school but soon enough he is sucked into the world of racism, violence and hooliganism, the skinhead movement takes him over and eventually he starts climbing up the ladder in the skinhead hierarchy.