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John Hampden (John Mills) pushes for world pacifism so ardently that he becomes blinded to his own family troubles. His wife, Stella (Yvonne Mitchell), has grown tired of his sanctimonious attitude and inattention. Meanwhile, his sons, Max (Andrew Ray) and Johnny (Peter Asher), have begun misbehaving at school. They decide that the best way to solve their parents' problems is to steal a plane and travel to Vienna, where they will present their father's political views to the world governments. Wikipedia