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Dresden Files book 16
Last Updated: September 3rd, 2014
I'll update as I find out more!
Here's what we know:
Title: Peace Talks
During his reddit.com question and answer session back in May (2014) Jim announced,
"Book 16 will be titled PEACE TALKS, and will probably be one of the more supernaturally violent books to date.

"
Book Begins: Three months after end of Skin Game and MAGGIE'S LIVING WITH HIM!
During his Q&A at Dragon Con (August 2014) Jim said,
"The next book will take place pretty much not too long after the end of this previous one. Normally, there's more or less a year in between them because there's more or less a year in between them and it's just simpler for me, but this one will be, I think there's only - only about three months have gone by. We'll start it in the middle of the next Summer where, you know, Harry is living with his daughter and trying to be a dad while all of this stuff goes down. On the other hand, Maggie does have this big dog and if you want to mess with Maggie you've got to get through the big dog."
Synopsis: While it's early to get a real synopsis, Jim let the following information fly at the Question and Answer he did in Seattle on May 30th (2014)*.
"A summit of the world's supernatural powers is being held to try to establish some sort of equilibrium and to get everything settled down in the wake of the vanishing of the red court. And I'm pretty sure everyone's going to sit down and have a nice cup of tea, there'll be a talk, and walk away holding hands."
Yes, the second half of this was delivered with Jim's typical dead pan humor.
More Molly: During the Reddit Q&A Jim also remarked that we would see a little of how Molly was coping with being the Winter Lady in Skin Game, but we would get more in book 16.
Conclusion: We are looking at some supernaturally violent peace talks during which we will see more of Molly, Maggie (I'm assuming by extension Mouse) and Harry trying to be a dad. Sounds like fun!