Wow! I haven't read a police procedural this good in a while. The stuff with the cellular memory was a neat twist. I was hooked from beginning to end and had to read it in one sitting. Even though this book is part of a series, it can be read as a stand alone as there is no cliffhanger (a plus in my book -- I HATE cliffhangers!). Dark heart is a well paced, clean read (another plus). This one is a definite win for Catherine Lee and I can't wait to read more of her work.