If you're thinking this book is about sirens aka the mermaid type...WRONG. That was my original thought when I found this book. There are NO mermaids in this book. NONE. It's about two worlds divided by the sea, one in a bubble below, the other a normal world above, and the secrets they hold, and let me tell you...it's a snore. The book at first is a bit interesting as there's some cool mysterious stuff going around, and then BOOM. Drops like a rock and it gets boring, quick. This book took me forever to read due to how boring it all gets and I decided to speed read the ending.