Senior sleuth Essie Cobb and her three gal pals Opal, Marjorie, and Fay take a cross-country train trip. Surely four little old ladies from the Happy Haven Retirement Home couldn't cause any trouble on a quiet journey across the country by rail, or could they? True to form, Essie and her friends manage to get into all sorts of trouble as they attempt to help fellow passengers in need. Will they make it to their destination all in one piece or will Essie and her friends get truly 'trained"