Dick Rover was blessed with a son and a daughter, as was likewise his brother Sam, while Tom Rover became the proud father of twin boys. As the four youths were of a lively disposition, it was considered best by their parents to send them to a boarding school, and in the first volume of the Second Series, entitled “The Rover Boys at Colby Hall,” I related what took place while they were attending that institution. From Colby Hall the scene was shifted to “Snowshoe Island” and then to stirring adventures while “Under Canvas.” Then the boys went “On a Hunt” and later to “The Land of Luck.” Then came further adventures at “Big Horn Ranch,” at “Big Bear Lake,” and then when “Shipwrecked,” where we last met them. In the present book the scene is laid first during the final days at Colby Hall and then on Sunset Trail in the far West. The boys had good times and also some strenuous adventures, all of which are related in the pages that follow.