The reason it cost me £nothing is because I have a chapter in it. I wrote it some time ago, so am eager to see where I now disagree with myself. Here's an excerpt:
The double-printing there is not deliberate, and appears in some other chapters as well. My guess is that the publishers picked up on it and sent the affected copies to we chapter-authors rather than to the book-buying public.
There are 18 chapters in the book, but it's the second edition so I may have read some of them in an earlier form. Unfortunately, the first edition is on the shelf in my office and is therefore inaccessible right now so I can't make a comparison. I don't mind, though, because I'll probably read them all again regardless.
Mine isn't the only chapter in the book that contains pseudocode, by the way. Just because it's about narrative skills, that doesn't mean it's not about games!