From the Central Series
- Robert and Mrs. Vanderhoff
- Bertie Vanderhoff
- Mrs. Gray
- Monsieur Andreyev
- Frederick Keller
- William Keller
- Monsieur LeBlanc
Chapter By Chapter Summary
Chapter One: A Grand Adventure
Chapter Two: The Red-Haired Man's Warning
Chapter Three: Secrets in the Reading Room
Chapter Four: The Spyglass
Chapter Five: A Dark Path
Chapter Six: Clues Underground
Chapter Seven: Footsteps in the Night
Chapter Eight: Search for a Thief
Chapter Nine: A Mysterious Caller
Chapter Ten: The Telltale Shoes
Chapter Eleven: Whispers in the Cathedral
Chapter Twelve: Thin Ice
Chapter Thirteen: Trapped
Chapter Fourteen: Escape
Discusses tourism and international tensions in Europe in the early 1900s. Topics covered:
- The belief many wealthy parents held about taking their children to Europe for educational purposes, as well as to show them the height of culture and sophistication.
- Threat of pickpockets and thieves that would prey on wealthy sightseers, leading tour guides to provide safety and convenience for their tour groups.
- The Eiffel Tower, which was built for the 1889's World's Fair and was considered as the tallest structure in the world.
- The Catacombs of Paris, originally built for mining stone and was later converted into an underground burial place in the late 1700s due to the lack of spaces for cemeteries.
- Political tensions that plagued Europe during the early 1900s, with Great Britain, France and Russia forming an alliance and competing for power again Germany.
- The realization few people had that Europe's political tensions would later on contribute to the cause of World War I.