Book 4 Update 9/3/13

As "Hitori" is shelved, while I wait for a book cover to be completed and my editor to have a free moment to do her thing, I've decided to jump straight into Book 4 of the main series. Normally, I would give a percentage of completion, but I won't. Not this time. This time I'm playing it by ear. Not because I'm ill prepared, but because I keep finding things I want to explore in more depth than I had previously prepared for. 

What starts off as a minor idea to nudge the plot in a specific direction, ends up compelling enough to expand into more. I don't want to get into details, it'll ruin the fun of the book. What I am getting at is that this book may end up longer than I had originally planned. It may also turn into another book. As this set/trilogy was supposed to be about the battle against the Lords and foreshadowing the next set of books, I can see ths easily being much longer than three books. The question that keeps poking me in the side is: How far do I go?

How many books are too much for one major point? Is it determined by if the subplots remain interesting and on point, or is there simply a time where no matter what you do, no matter how good the subplots are, there is just too much time spent on a major piece of the puzzle? So far, I don't have an answer to that.