The Book of Fours

From Author Wars - https://authorwars.com/publications/the-book-of-fours-291784.html

Overview:

Title: The Book of Fours
Author: Nancy Holder
Year: 2001
Publisher: Pocket Books / SFBC
Price: $11.50
Pages: 337
Binding: Hardcover
Type: Novel
Title Reference: The Book of Fours
Notes: This is similar to the Pocket edition, except it lacks a price and has the SFBC number on the back jacket.