I’m about halfway through the first draft of book five. Not sure yet when it’s going to be ready, but probably early 2019. I’ve pushed to deliver the last two books before Christmas-but I no longer think that’s a good time to deliver a book, and I don’t want to compromise quality. So my best guess right now is first quarter 2019. I wish it could be sooner, but other commitments (e.g. the job that feeds my family) restrict my writing time. I’m hoping to lift my writing rate next year though.