For Jan, life with Ona is heaven on earth. She is not only his favorite cow, but also his best friend. But Ona is ill and Jan resolves to look after the animal to the bitter end. For Jan's father, however, Ona is a burden. Nobody can afford a sick cow, he says. Jan wants to protect his girlfriend with his life. But one day the time has come and Ona falls victim to the slaughter. Jan will never forgive his father for the murder. Never!
