This was great read and very enjoyable. The only problem was that I guessed the ending very early on in the book. However I didn't have the full how's and whys so even though I knew who the murderer was, there was enough missing pieces to continue being intriguing. 

Although I am not a pregnant woman, I am not fully convinced that Agent Keller could have done all the things she did at 8 months pregnant with twins but I'm not an expert on the matter.