Free at Amazon:
A Killing Rain (Louis Kincaid #6) by P.J. Parrish. Published by Pinnacle in 2005.
Goodreads
AU:
http://www.amazon.com.au/dp/B00EV43P3A
CA:
http://www.amazon.ca/dp/B00EV43P3A
UK:
http://www.amazon.co.uk/dp/B00EV43P3A
US:
http://www.amazon.com/dp/B00EV43P3A
Not available at B&N, Kobo, or Google Play at the time of posting.