When a Trilogy Becomes a Sextuplet

After the launch of his newest book a few weeks ago I asked writer Michael J. Sullivan if he could spare some time to talk about his writing process. In addition to being talented, Michael also happens to be one of the humblest and kindest writers it’s been my pleasure to meet. It’s my pleasure to turn the blog over to him.
I recently released Age of Myth, the first novel in my new series. It’s the one with the big tree on the cover. Since people ignore advice, and nearly everyone actually does judge books by their covers, it’s a good thing for me that trees appear to be popular (no pun on poplar intended… okay maybe it was).
My first series The Riyria Revelations is six books long. This new series was supposed to be a trilogy. You’ll note I used the word supposed in that sentence. When I write a novel it almost always tops off around the 100,000-130,000 word mark (around 375-450 pages). I don’t plan it that way — just happens. It’s the length I need to tell a self-contained tale. Apparently I also have a set number when it comes to how many books it takes to write a series. You guessed it, my trilogy grew to six books long (okay, you had help from the post’s title). No, the publisher didn’t make me expand it, and Peter Jackson had nothing to do with it. The story takes place during a great war, but the story stopped before all the conflicts were over. I had a suspicion readers weren’t going to like that. I didn’t either. Quitting before the war was 100% resolved felt unfinished.