The Violet Keystone

From Author Wars - https://authorwars.com/publications/the-violet-keystone-980841.html

Overview:

Title: The Violet Keystone
Author: Garth Nix
Year: 2009
ISBN-10: 9780439176873
Publisher: Lucas Books / Scholastic
Price: $6.99
Pages: 233
Binding: Trade Paperback
Type: Novel
Title Reference: The Violet Keystone
Notes: "This edition first printing, May 2008" Assumed twelfth printing per number line 20 19 18 17 16 15 14 13 12 - 9 10 11 12 13 / 0 Cover artist credit and prices on back cover. Juvenile reading level 008-012 years. C$7.99 in Canada. Reading level 4. Data from an archive.org copy