The Letter for the King

From Author Wars - https://authorwars.com/publications/the-letter-for-the-king-461980.html

Overview:

Title: The Letter for the King
Author: Tonke Dragt
Year: 2013
ISBN-10: 9781782690429
Publisher: Pushkin Children's Books
Price: £9.98
Pages:
Binding: ebook
Type: Novel
Title Reference: The Letter for the King
Notes: Amazon Kindle's page count 460. Data from Amazon UK as of 2014-07-27. Price from W. H. Smith as of 2014-07-27.

Imprint from British Library (BL, below) as "Pushkin Children's Books, 2013". Library records (BL and OCLC) provide a full list of Contents including about 50 chapters in 8 numbered and title Parts. This edition is likely to contain interior illustrations by Dragt although libraries do not report them.

As of 2022-08-30 Amazon UK provides cover image and "Look inside" the 2020 Netflix tie-in (see), as this ASIN and "Pushkin Children's Books (7 Nov. 2013)".