Finally finished and uploaded book four to Amazon, Barnesandnoble.com and Smashwords.com. It should be available April 12, 2013 but will take a couple of weeks to reach Sony, Kobo, and other online retailers. My brain feels like the title of my new book...
Buy it now on smashwords.com for epub and mobi
Buy on Amazon for Kindle/Mobi
Buy on Barnesandnoble.com