In which the Camp-bell family, seeking to remedy Mac's enforced inactivity, journey to the welcoming mountain retreat of Cosey Corner, where the cheerful Atkinsons and their lively band of children dispense hospitality and rustic diversion. Among quaint entertainments and innocent pageantry, Mac finds fresh amusement in town-planning and nature-study, while all delight in the simple pleasures of wholesome companionship and out-of-door life.