Vortex was published in January 2014 and has received excellent reviews - not just on Amazon but in the print media. One of my favourites is here - Pattaya Mail review
Better still, literary web-site BookBag lists Vortex as one of its Top 10 Self-published books of 2014.
BookBag Top 10
I hope you will check it out on Amazon.
The sequel - Vortex... the Endgame was published in November 2014 - Amazon links are below.
Sequel on UK site
Sequel on Amazon.com