Good thriller with lots of puzzles for the reader to ponder between page turns. It is, in every sense of the word, an adult novel. Graphic descriptions of sex and violence are frequent. It is not gratuitous, but nonetheless strong stuff. But if you're not squeamish it adds a healthy dose of realism to the story. Interesting twists and turns of discovery which remind me a bit of stories like Seven, Silence of the Lambs, etc ... You get the idea, extreme psychopathology on display. In that tradition, the book works well and doesn't disappoint. The final few chapters barely allow the reader to come up for air, so savor the story and set aside as much time as it takes. Might mute your phone too ;)