I don't know what it is, but when I pick up a Greg Iles book I cannot put it down. This is the 3rd book of his I've read and I already know I need to read the rest of his books. This has got it all: mystery, thriller, action/adventure, and science.Alex Morse's sister confesses, on her deathbed, that her husband is to blame. Alex, being an FBI agent, goes rogue and discover there is way more to the case than she imagined. More people are involved, including a crooked lawyer and a research doctor. Kind of spooks me if half of what they talked about in this book is true. Having just finished my Hematology rotation, I was surprised to find out that I understood most of the medical jargon in the book :)