Question for those that have read King Sorrow…

I was at my local bookstore the other day to pick up this book and as I was checking out I overheard two people discussing the book a few feet away from me. They didn’t see that I had the book in my hand and I overheard them say “and when Arthur died I was so shocked”. I didn’t hear much else and initially didn’t think much of it because I had no idea who Arthur was. Later that night when I started the book I realized that Arthur appears to be one of, if not THE, main character.

Did these people ruin the book for me? I’m still going to read it regardless, but I was pretty annoyed to have such big reveal spoiled for me before I even started.