Free Kindle Book: Edge of Apocalypse

Amazon currently has Edge of Apocalypse by Tim Lahaye as a free Kindle Download.  This is the author of the Left Behind series that was popular a few years back.  I read several of those, and they were really good. I have heard of this book before, but I thought it was part of a new series.  The description doesn't say anything about it being a series though.  Does anyone know?