Summer of Long Knives is now officially out. I strongly encourage you to buy it, or to borrow it from someone who has. (Of course, I would do that, but other people assure me that it’s worth doing.)
Here’s where it can be gotten (courtesy of Goodreads). Of course, if you’re committed to buy from your favorite independent bookstore, and they haven’t stocked the book, just give them the title and they can order it for you.