Weird, Cryptic, Annoying, yet....Surprising. 
 I don't know how will I review this book. 
 The first half of it was really boring that I almost gave this up. However, I was so eager to discover the Truth, unlocking the mystery of what happened with 
 The Liars 
 . I made some guesses of how will this end. Towards the end of the book... 
 HOLY SH*T. 
 My theories: 
 (view spoiler)[ 1. Cady bumped her head. Which caused a major mental problem because of this accident. 
 2. The Liars died in the accident and their souls were stuck in the island, just waiting Cadence to remember it so she herself would discover the truth / help her to discover the truth.. 
 3. Unresponsive emails. Hmm.. The Liars hid a secret.Something that broke their friendship or some family problem regarding with inheritance. Or their grandfather told them not to say anything. 
 How did I see it coming? 
 - Johnny's mother was emotional, and holding his jacket. 
 - The characters just disappeared all of the sudden. 
 - When Cady felt one of the character's having a cold skin. (hide spoiler)] 
 I saw it coming with the help of some clues. Somehow, I was able to decipher its mystery. I just couldn't believe (view spoiler)[Gat fucking died. why kill the smartest character? geez. This frustrated me the most because he's my favorite. (hide spoiler)], at some point, I am annoyed with the Grandfather, he was like one of the characters of a Sidney Sheldon book. He's so manipulative and I hate it. While the rest of the characters are whiny and act like spoiled brats. (except Gat. I love Gat.) 
 I like the last part of this book, some parts doesn't need to be elaborated and let's just say leave it for good. It's still a thumbs up for me but not my favorite.