From publisher blurb:
Those of you who have purchased Redhurst Academy of Magic and read it through know that it’s a gold mine for DMs hungry for adventure ideas. Due to the nature of the book, however, we weren’t able to spell out adventure hooks directly in the book, as that would have broken the metaphor under which the book was constructed. The spy who wrote the bits in the margins, for instance, couldn’t just throw in advice for DMs as she went along. It just wouldn’t fit.
Through the wonder of the World Wide Web, however, we’re able to offer you official enhancements to The Redhurst Academy of Magic, free of charge. Since this is an adjunct to that book and not actually part of it, we are free to break the book’s fourth wall, so to speak, and address d20 System DMs directly.