The Wrath of Mulgarath

From Author Wars - https://authorwars.com/publications/the-wrath-of-mulgarath-510143.html

Overview:

Title: The Wrath of Mulgarath
Author: Tony DiTerlizzi, Holly Black
Year: 2005
ISBN-10: 0439821622
Publisher: Scholastic
Price: $8.95
Pages: 139
Binding: Hardcover
Type: Novel
Title Reference: The Wrath of Mulgarath
Notes: First Scholastic printing: October 2003
Book design by Tony DiTerlizzi and Dan Potash
Copyright page also has ISBN 0-439-73568-8, which is different than the ISBN on the back cover. This ISBN matches one used on another printing which Amazon.com identifies as published by Scholastic. Based on a similar entry for The Field Guide, it is more likely a later printed edition of the hardcover from Simon & Schuster Children's