This is the 6th book in the Rizzoli and Isles series by Tess Gerritsen. Another page turning book, no doubt. But here you get the whole gruesome details of decapitations, dismemberment, scenes and symbols. An international group of priviliged scholars, anthropologist, etc. screened liked minded people to join their club seeking and tracking "evil". They wanted to learn and try to solve the mystery that lies beneath evil. The presence of evil walking around in the streets and blending in with people. We could never really know what evil a person is capable of doing. Are some people just inherently bad or are some descendants of the devil?