The Folding Knife

From Author Wars - https://authorwars.com/publications/the-folding-knife-314267.html

Overview:

Title: The Folding Knife
Author: K. J. Parker
Year: 2010
ISBN-10: 9781841495118
Publisher: Orbit
Price: £12.99
Pages: 512
Binding: Trade Paperback
Type: Novel
Title Reference: The Folding Knife
Notes: Data from Amazon UK as of 2010-04-01
This is very like a phantom publication. Another trade paperback edition was published four months later in the UK, priced at the more reasonable £8.99, which indicates it is a first edition. The source for this record (Amazon.co.uk) shows the title is "Currently unavailable" (Amazon-speak for "never published" or "book from another market"). This may have been the ISBN assigned to an advance review copy of the title. The date from Amazon is 2010-02-04 but that is too early for the official publication.