The Sin

From Author Wars - https://authorwars.com/publications/the-sin-358257.html

Overview:

Title: The Sin
Author: Robert Vaughan
Year: 1979
ISBN-10: 0890834792
Publisher: Zebra Books / Kensington Publishing Corp.
Price: $2.50
Binding: Paperback
Type: Novel
Title Reference: The Sin
Notes: Information on this book from The Whole Science Fiction Data Base 6 & ABE. "First Printing: May, 1979" on copyright page in ebay.com photo (which is a third printing from 1980).