There are no words to adequately describe how good this book was. It doesn't matter if you think you know who did it, or if you know why they did it. It doesn't matter if you were spot on correct- if you guessed it from the first page. Tana French grabs you from the very beginning and never once lets you go. She writes with such sharpness and edge that you find yourself sliding off the chair with anxiety, going up a notch with every page you turn; taking what could just be another ordinary whodunit and creating this animal of a story that roots itself in your brain. Definitely 5 stars. Can't wait for her fifth...(hope there is a fifth in the works...!)