This book was hard to rate. The dialogues sounded quite unnatural and the style was always the same although the story was told by four narrators. But the plot was just perfect. The whole idea, the background of the characters, the tension, the twists - it's one of those books that you just can't put down. I kept skimming the pages just to see what's going to happen and then coming back to thoroughly read everything. So, I just couldn't give less than five stars to such an exciting (and sometimes even spooky!) book. Absolutely recommended to everybody who enjoys a good creepy mystery