The Beast

From Author Wars - https://authorwars.com/publications/the-beast-908121.html

Overview:

Title: The Beast
Author: Jonathan Fast
Year: 1981
ISBN-10: 0394515293
Publisher: Random House
Price: $12.95
Pages: 290
Binding: Hardcover
Type: Novel
Title Reference: The Beast
Notes: Stated First Edition Month ("5/81") on back flap of Archive.org copy, which also credits Fred Marcellino for jacket design.