This book is divided in 3 chapters:
Part I - Hayao Miyazaki's Concept Sketch Collection
The first part of the book works as an Introduction, containing a brief production diary and sketched storyboards. It is of particular interest to be able to see Miyazaki's work in its sketching phase.
Part II - Concept Art, Background Art, Character Designs and Character Sketches
This second part is where the book really comes alive. Character Designs and Concept Art are wonderfully detailed, and are accompanied by statements from Miyazaki's crew. I suppose it's a little disappointing that there are no words from Miyazaki himself, but this absence does not come as a surprise.
Part III -. Final Screenplay
Self-explanatory, the last 50 pages or so contain the final screenplay, in text. Probably the least interesting part of the book.
Overall, it's a beautiful book, filled with wondrous artwork and insight into what is probably Miyazaki's most enigmatic film, and to me, one of his best.