This book was different from majority of the Thrillers I tend to read. In a good way. 
With this you have the POV of the killer himself. This made the reading experience for me darker. You get to see how he feels, his growing frustration with Eve. Knowing who he was from the beginning was interesting. Made me more intrigued to see him get caught. 

We also get the POV of Eve, a surviving victim. As well as parts of the book she is writing. Jumping between all these POV and the book made me more captivated. It was interesting to have the postscript from Eve's book. Or the acknowledgements. 

The twist towards the end shocked me. Even though looking back clues where there. I just looked past them, too deep into the story to try analyse what was being told to me. Even the twist from the killers side surprised me. 

Reading Eve's experience from the night her family was murdered was heartbreaking. So was all the other victims stories. It was a dark and intense read, that captivated me from the very start. I was rooting for Eve to catch the killer and get the justice they all deserve.