I'm just gonna copy this out from Koji's post:
A few months ago author Nicholas Sansbury Smith asked me to write in his bestselling Extinction Cycle Kindle World series. The books are a culmination of badass military action and well-researched medical science that bring the zombie apocalypse to life in a way never seen before.
I’ve written a story called OPERATION: Survive about a father and son who try to survive the end of the world. You can download my book on Amazon for the low low price of $1.99 (Don’t worry, you don’t need to own a Kindle to read it).
For those that aren’t familiar with the Extinction Cycle you can check out the six books here. As I have said millions of times, one of my favorite zombie book series EVER