Nothing But the Night

From Author Wars - https://authorwars.com/publications/nothing-but-the-night-926713.html

Overview:

Title: Nothing But the Night
Author: John Blackburn
Year: Unknown
ISBN-10: 0586034390
Publisher: Panther
Price: £0.35
Pages: 157
Binding: Paperback
Type: Novel
Title Reference: Nothing But the Night
Notes: Movie tie-in edition. Info from copy on richarddalbyslibrary.com. Other prices on back cover: Canada $1.25, South Africa 85¢, Singapore $3.50, Australia & New Zealand $1.10. Only the first Panther edition's 1971 date is on the copyright page; the film was released in February 1973 according to Wikipedia, so this edition likely came out around the same time.