The Clockwork Three

From Author Wars - https://authorwars.com/publications/the-clockwork-three-365070.html

Overview:

Title: The Clockwork Three
Author: Matthew J. Kirby
Year: 2011
ISBN-10: 9780606234856
Publisher: Turtleback Books
Price: $17.20
Pages: 390
Binding: Hardcover
Type: Novel
Title Reference: The Clockwork Three
Notes: Turtleback School & Library Binding Edition.
Date from Amazon.com as of 2011-10-22.
Cover artist credited only in acknowledgements, no signature visible