This book presents an unimaginable mystery, unavoidable danger, and unbelievable adventure. Eleven-year-old twins Jason and Julia have moved with their parents to an old mansion on the Cornish coast. The place is full of secrets, and before long Jason, Julia, and their friend Rick find a mysterious-looking door. What lies behind? And why has someone tried to conceal it? The three friends are determined to find out, no matter what it takes...

 

This book is part of a book series called Ulysses Moore .

There are 240 pages in this book. This book was published 2007 by Scholastic .

Iacopo Bruno is a graphic artist and illustrator who lives in Italy.