The deaf-born "Bueb" and his sister Belli live with their mother and father on a remote farm in the Swiss mountains. The father consciously resists modernity and refuses to take the boy to an appropriate institution. Belli, on the other hand, would have liked to become a teacher, but now has to teach her brother. The two siblings form an inseparable couple and soon get dangerously close. – Repeatedly declared to be the best Swiss film of all time.