The Island at the Top of the World

From Author Wars - https://authorwars.com/publications/the-island-at-the-top-of-the-world-445610.html

Overview:

Title: The Island at the Top of the World
Author: Ian Cameron
Year: 1974
ISBN-10: 0330241400
Publisher: Pan Books
Price: £0.40
Pages: 189
Binding: Paperback
Type: Novel
Title Reference: The Island at the Top of the World
Notes:
Movie tie-in Month from amazon.uk Cover artist from this page, which shows movie poster with the same art, apparently credited to Brian Bysouth. Price on back cover in richarddalbyslibrary.com photo; other prices: Australia $1.25, New Zealand $1.20, Canada $1.50.