I was FURIOUS when I finished this book. The whole way through, I'm wondering why some characters (the interesting ones) just dropped off the face of the earth. Turns out, it's because this is only half of Book 4. Book 5 is the other half. But Book 5 isn't further along in the chronology of the story... it's literally the other half (think of them as the left & right halves of one book, not the first part and the second part). Book 5 will be the same time period, just different characters. It's an interesting way to write a book, a neat experiment, certainly. But it wasn't nice of the author to mention this is how Book 4 and 5 work AT THE END.