- 1Chapter I — The Empty House
- 2Chapter II — The Princess Sylvia
- 3Chapter III — The Shuttered Window
- 4Chapter IV — An Interview With Hercules
- 5Chapter V — The First Link
- 6Chapter VI — Uncle Jasper’s Diary
- 7Chapter VII — Sylvia’s Story
- 8Chapter VIII — The Footprints on the Stairs
- 9Chapter IX — The Trials of an Explorer
- 10Chapter X — The Secret Passage
- 11Chapter XI — A Cure for Rheumatism
- 12Chapter XII — The Spirit of a Princess
- 13Chapter XIII — The Masquerade
- 14Chapter XIV — An Uninvited Guest
- 15Chapter XV — Hercules’ Story
- 16Chapter XVI — A Letter
- 17Chapter XVII — Waiting
- 18Chapter XVIII — Katherine Goes to the City
- 19Chapter XIX — The Further Adventures of Katherine
- 20Chapter XX — The End of a Perfect Day
- 21Chapter XXI — Father and Daughter
- 22Chapter XXII — One More Toast
The Camp Fire Girls Solve a Mystery
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