Secret of the Tower

From Author Wars - https://authorwars.com/publications/secret-of-the-tower-270647.html

Overview:

Title: Secret of the Tower
Author: Debra Doyle, James D. Macdonald
Year: 2001
ISBN-10: 0340841273
Publisher: Hodder Children's Books
Pages: 134
Binding: Trade Paperback
Type: Novel
Title Reference: Secret of the Tower
Notes: Data compiled from various Internet sources and by inference from other editions / other titles in the series.