or The Secret of the Locked Tower
Billie and her chums come to the rescue of several little children who had broken through the ice. There is the mystery of a lost invention, and also the dreaded mystery of the locked school tower.
5. BILLIE BRADLEY AT TWIN LAKES
or Jolly Schoolgirls Afloat and Ashore
A tale of outdoor adventure in which Billie and her chums have a great variety of adventures. They visit an artists’ colony and there fall in with a strange girl living with an old boatman who abuses her constantly.
6. BILLIE BRADLEY AT TREASURE COVE
or The Old Sailor’s Secret
A lively story of school girl doings. How Billie heard of the treasure and how she and her chums went in quest of the same is told in a peculiarly absorbing manner.
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