Rereading

So when I started reading my newer book, "House of Hades", I realized how confused I was.  I decided to skim through the books previous to the House of Hades. I was really surprised at how much I forgot. After I skimmed through the rest of the books, I read the portion of my new book that I read already and it made so much more sence. So if u are stuck in a series, look back at the previous books.