I wonder why they won’t publish this book in other languages. It surely has some answers for your questions about Monster series. It reveals more background stories and what-was-going-on-while-you-weren’t-theres which you can’t find out just by going back pages. Although I have to admit that it was hard to read a book full of letters, it's worth reading.

349 pages,
26 photo pages,
5 extracted picture pages,
27 sketch pages,
8 ? pages