After the discovery of the gold mine on Grizzly Slide, and the subsequent troubles with the claim-jumpers, Polly and her friends sent for John Brewster who was engaged to Anne Stewart, and Tom Latimer, John’s best friend, to leave their engineering work on some mines, for the time being, and hasten to Pebbly Pit to advise about the gold mine, and to take action to protect the girls. These experiences are told in the second volume of this series.

Success being assured in the mining plans of the gold vein on Grizzly Slide, and the valuable lava cliffs located on Pebbly Pit ranch also finding a market as brilliant gems for use in jewelry, Polly and Eleanor decided to accompany Anne Stewart to New York, where she was going to teach in an exclusive school for young ladies.

In the third book, Polly and Eleanor’s adventures in New York are told. Their school experiences; the amateur theatricals at which Polly saved a girl from the fire, and thus found some splendid friends; and the new acquaintance, Ruth Ashby, who was the only child of the Ashbys. They also met Mr. Fabian in a most unusual manner, and through him, they became interested in Interior Decorating, to study it as a profession. When the school-year ended, all these friends invited the two girls to join their party that was planned to tour Europe and visit noted places where antiques are exhibited.

The following fourth book describes the amusing incidents of the three girls on board the steamer, after they meet the Alexanders. Mrs. Alexander, the gorgeously-plumed ranch-woman; Dorothy, always known as “Dodo,” the restive girl of Polly’s own age; and little Ebeneezer Alexander, too meek and self-effacing to deny his spouse anything, but always providing the funds for her caprices. This present caprice, of rushing to Europe to find a “title” for Dodo to marry, was the latest and hardest of all for him to agree to.

Because of Mrs. Alexander’s whim, the ludicrous experiences that came upon the innocent heads of Polly and her friends, in the tour of England in two motor cars, decided them to escape from that lady, and run away to Paris. Before they could sigh in relief at their freedom, however, the Alexanders loomed again on their horizon.

Plan as they would, the badgered tourists found that Mrs. Alexander had annexed herself permanently to them. They resigned themselves to the inevitable. But that carried with it more ridiculous affairs, when Mrs. Alexander plotted for the titles found dangling before her, in various places on the Continent.

One good result came from this association with the Alexanders: Dodo found how fascinating the work of collecting really was, and decided to study decorating as an art. Hence she spurned her mother’s ambitions for her, and announced her plan of remaining in New York with the girls, upon their return to America, to follow in their line of study.

Mrs. Alexander felt quite satisfied to live in New York for a season, as she fancied it an easy matter to forge a way into good society there. But her spouse detested large cities and longed for his mining life once more, but agreed to it because Dodo was delighted with the opportunity opened before her, in the profession of decorator.

Polly’s party on board the steamer consisted of Mr. and Mrs. Ashby and Ruth; Mr. and Mrs. Fabian and Nancy; Mr. and Mrs. Alexander and Dodo; and lastly, Polly Brewster and Eleanor Maynard.

Just a word about the last two girls: Polly knew that Eleanor was fond of Paul Stewart since she met him a few years before. And Eleanor wondered if Polly preferred Tom Latimer to any other young man she knew; but Polly always declared that she was married to her profession and had no time to spare for beaus. Hence Tom Latimer sighed and hoped that she might change her mind some day.