Dave is still at his well-liked boarding-school, Oak Hall, with his lively but manly comrades, who rejoice with him that he not only has discovered his parentage, but has a father and sister living, though unaware of his existence. Dave cannot rest until he finds those of his own family, and having secured leave of absence from school and accompanied by his chum, the son of a United States Senator, he goes to England only to find that his father has left on an expedition to the upper part of Norway. The boys follow in a most exciting pursuit which is replete with adventure.