The Calling

From Author Wars - https://authorwars.com/publications/the-calling-349273.html

Overview:

Title: The Calling
Author: David Mack
Year: 2009
ISBN-10: 9781416579922
Publisher: Pocket Books
Price: $15.00
Pages: 326
Binding: Trade Paperback
Type: Novel
Title Reference: The Calling
Notes: Edition statement: Original
Data from Amazon.com as of 2011-04-07.
Cover artist is partially obscured by a sticker on the back cover of the copy on Archive.org so it was taken from a copy on eBay.