I really liked how the story which told, it felt so real this all Could have happened this way and Could Possibly be happening like that in the future. The author knows how to create suspense, but he Could not always uphold it. Some parts of the book were a bit tedious. But all in all, a very good book and to unsettling story Which, well, will probably never let you go again!
(I watched the film a week after I've finished the book, and I really liked it! The film managed to convey some of the atmosphere I missed in the book, as it is written in a somewhat factual and levelheaded way. But on the other hand, I think did some important details were left out in the film.)