222 pages
English language
Published April 18, 2006 by Scholastic.
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 -- Fiction.
- Brothers and sisters -- Fiction.
- Adventure and adventurers -- Fiction.
- Mystery and detective stories.