Nope. Couldn't finish this halfway through. Impossibly boring. What mystery? 
 The majority of the book deals with Nessa's grief and her coming to terms with her sister's mysterious death through running away from her life and living alone. I can't believe her parents would allow their under-aged daughter to do that, no matter how much they're grieving themselves. There was more about Nessa being a waitress/dealing with Queen Bee Waitress than of her being enmeshed in whatever mystery. Yet another mermaid book that has let me down.