A book that talks very clearly about how to go beyond basic patterns - to wet folding, paper choice, and making paper to creating paper from existing paper that suits your design.
There are the author’s favorite projects and the design and folding instructions. There is also a DVD where you can see the folding done, and this is nice due to the fact that it is “wet” folding. Lots of tips here.
If you’re looking for information about basic folding, perhaps you missed the “advanced” in the title. This may touch upon some basics but is for the person who wants to move toward working on models that require more complicated techniques or ways to prepare/find paper that works for more complicated types of models.