Octagon

From Author Wars - https://authorwars.com/publications/octagon-24701.html

Overview:

Title: Octagon
Author: Fred Saberhagen
Year: 1981
ISBN-10: 044160739X
Publisher: Ace Books
Price: $2.75
Pages: [5]+272
Binding: Paperback
Type: Novel
Title Reference: Octagon
Notes:
• "First Ace Printing: July 1981" • Full number line 2468097531 • The artist is not credited; there is a signature on the artwork, not quite clear enough to 'decipher'.