There had been other vacations which the chums had shared, prominent among them being that interesting and exciting summer spent at Twin Lakes. Another, more recent adventure was that which befell them at Treasure Cove where the three girls and their friends unearthed an old sea chest filled with rare silks, carved ivory, coins, and precious gems.

In the volume directly preceding this, entitled, “Billie Bradley at Sun Dial Lodge,” Billie and her chums met with a series of alarming but fascinating adventures which finally led to the solution of an astonishing mystery.

Billie, who had been christened Beatrice but was seldom called by the more formal name, was a dark-haired, dark-eyed, energetic young person, whose overflowing vitality constantly demanded action. She was the undoubted leader of her small group and it was a tribute to Billie’s personality that her friends not only deferred to her, but liked doing it.

Billie’s family was small, but suited her exactly. Martin Bradley, her father, was a real estate and insurance broker, at which he was moderately successful. Mrs. Bradley was a charming woman, loved by her friends and adored by her family. There was a son, Billie’s brother, Chetwood, commonly known as Chet. Between this brother and sister was a genuine regard and a similarity of tastes, a foundation for the best kind of comradeship.

Perhaps Billie’s very best chum was Laura Jordon. Laura was fair-haired and blue-eyed and somewhat spoiled by being able to do as she liked about almost everything. Teddy Jordon was fair-haired and blue-eyed like his sister, a fine lad who was popular with boys and girls alike. Raymond Jordon, the father of the likable pair, owned a controlling interest in the big jewelry factory at North Bend, thus providing his offspring with a bit more spending money than was strictly good for them.

Violet Farrington, another very good chum of Billie’s, was an only child but a very happy one, blessed with a pair of doting parents who made up to her whatever lack the girl might otherwise have felt in her brotherless and sisterless state.

Beside Chet Bradley and Teddy Jordon, there was a third lad often found in the company of Billie and her chums. His name was Ferd Stowing. Ferd was a likable, easy-going young fellow with a commendable knack for making other people comfortable.

These three boys attended Boxton Military Academy, the school for boys on Lake Molata, directly across from Three Towers Hall. When at home the sextette of young people lived at North Bend, a thriving town of some twenty thousand inhabitants. Forty miles of railroad travel transported one from the heart of North Bend to the heart of New York City. It was a pleasant place to live, as the boys and girls agreed.

During their activities in and about North Bend and at Three Towers Hall, the girls had encountered many adventures, some thrilling, some sad, but all more or less spiced with danger. None, however, had found them in such desperate fix as the one in which they were now involved.

Billie hung over that precipitous drop to the rocks at the base of the cliff with only the stout cloth of her dress between her and almost certain death.