I enjoy the Nikki Heat series, probably more than I should. I like the old school mystery to the novels and the way the NYPD is portrayed is excellent. However, with the last novel Frozen Heat, as much as I liked it, I was apprehensive over the whole spy angle. I like spies but they belong in spy novels not detective mysteries. 
 So imagine my blessed sigh of relief when I saw a good resolution to the spy angle in Deadly Heat. Not only is Nikki struggling to close her murdered mother's case but also has to deal with a crazy serial killer who has his eyes set on her. 
 Deadly Heat was good but I'm more excited for the next one. I'm interested to see where this series goes with such a huge driving source finally braked.