222 pages
English language
Published April 18, 2007 by Scholastic.
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After moving from London to an old mansion on the English coast, eleven-year-old twins Jason and Julia discover that their new home has twisting tunnels, strange artifacts from around the world, and a mysterious, locked door.
Subjects
- Twins -- Juvenile fiction.
- Brothers and sisters -- Juvenile fiction.
- Twins -- Fiction.
- Brothers and sisters -- Fiction.
- Adventure and adventurers -- Fiction.
- Mystery and detective stories.