If you see this on New Year’s Day, you can download three of Matt Bracken’s books for free on Kindle. These are all fantastic books; I’ve read each of them 2-3 times. They are fiction, but packed full of real information. Get them while you can.
Author page on Amazon for the rest of his books. The first two above are the first in a set of trilogies. Unrelated, but both trilogies are excellent. The third book of the Castiogo Cay trilogy just came out and it is his best yet.