That people like to kiss cheeks. And that you're Hungarian. So, both, I guess.

There are lots of books on the undead. Mindless and not.

Tolkien considered it to be one book. The publishers had him chop it into three because they weren't sure how well a book as big as it turned out to be would sell. Especially during war time when paper was scarce.

... I can't believe I know that.

But yeah, book one is important to the overall story. It's the set up.