Title: Through the hidden door
First published: 2002
Description: Two boys stumble upon the remains of an ancient underground civilization.
Subjects: Bullies, Fiction, Boarding schools, Schools, Friendship, Mystery and detective stories, Reading Level-Grade 5, Reading Level-Grade 4, Reading Level-Grade 7, Reading Level-Grade 6, Reading Level-Grade 8, Fantasy, Children's fiction, Juvenile fiction, Detective and mystery stories
LC classification: PZ7.W46843 Th 2002