Lisa Gardner hit it out of the park with this one. I loved it. It began a little darkly, but once I was into it (by just a few pages) I could not put it down. There are deeply developed characters, all of whom kept me guessing. I became protective of Melanie Stokes ("the other daughter") almost immediately. There were multiple plots, or mysteries, and it was difficult for me to determine which to focus on first. In her distinctive way, Ms. Gardner helped keep my focus on everything (!). Without giving anything away, I couldn't figure out who the bad guys were and who were not.
I personally have attended an execution in Huntsville, TX and appreciate the author's research and resultant accuracy. Lisa Gardner has always impressed me in that regard.
This is a stand-alone novel. However, if you haven't read her 6-book FBI Series, this would be a great read before FBI Book 1, The Perfect Husband.
If you figure out what's happening before the last 7/8ths of the book, you're a better sleuth than I. Definitely an enjoyable, intense read.