Watchtower

From Author Wars - https://authorwars.com/publications/watchtower-261035.html

Overview:

Title: Watchtower
Author: Elizabeth A. Lynn
Year: 1981
ISBN-10: 0425050084
Publisher: Berkley Books
Price: $2.25
Pages: 226
Binding: Paperback
Type: Novel
Title Reference: Watchtower
Notes: Third Printing.
Printed in the United States of America
Cover on URL is probably an earlier printing, this version has "1980 World Fantasy Award Winner" in the banner below the author's name.