Warlock

From Author Wars - https://authorwars.com/publications/warlock-261165.html

Overview:

Title: Warlock
Author: Ray Garton
Year: 1989
ISBN-10: 0380757125
Publisher: Avon
Price: $3.50
Pages: 228
Binding: Paperback
Type: Novel
Title Reference: Warlock
Notes:
1st printing as per number line. Movie tie-in. Price in Canada C$4.50 Julian Sands, who plays the title role in the movie, is on the cover. Per Wikipedia, he went missing while hiking in California in January of 2023 but his remains were not found until June; cause of death was "undetermined".