A cheerful girls' story follows Cathalina and her campmates as summer ends and they reunite with family for a surprise house-party voyage to the city. The narrative moves from lakeside goodbyes and camp launches to train and steamer travel, with a kindly relative arranging accommodations and social plans. Counselor figures, friendships, and playful domestic scenes illustrate camaraderie, emerging responsibility, and the small adventures of teenage life against coastal and urban backdrops.