Two fans let me know that the As The World Dies: Siege Kindle version was no longer for sale on Amazon.com. I looked into the situation and I followed the advice Amazon gave to get it back on sale (until it is permanently pulled in about a month or so).
Evidently, with a lot of the new options and upgrades that are going on, some of the books published before the changes require more information to be entered in the listing. I had to enter whether or not I wanted the book to have DRM or not. I chose not to have DRM.
It may take several days before it is back on the Kindle store.