This book is the exact definition of a boring book with a great ending. Keep that in mind. 
 The story follows Cadence, a teenager from a rich family. They meet up on their private island every summer. But something happened in the fifteenth summer. Cadence can't remember anything. 
 The first three quarters were really plain and boring. Nothing really happened, and the cries of spoiled families do not touch me. At all. 
 But the final part. You don't see it coming. You did not expect it, but it exists. And it is great. 
 If you don't like short phrases-based writing, don't read it. It will upset you. 
 Overall, it is a nice and easy read, but not consistent or with a fantastic plot.