I didn't *love* this book. But...I hate to give none other than a five star to Jennifer Donnelly. The first two books were ^amazing^ 
 So I was disappointed with the third book. It just didn't go the way I expected. And...I thought there were going to be more books. Six, exactly. One for each mermaid. 
 Here's what I thought about the narration: 
 Deep Blue: Sera narrates it. 
 Rogue Wave: Sera and Neela narrate it with revolving chapters. 
 Dark Tide: (What I expected) Sera and Ling narrate it with revolving chapters. 
 Sea Spell: (What I expected) Sera and Astrid narrate it with revolving chapters. 
 Then so on with Becca and Ava. 
 Because, well, still. 
 So it was a good ending. And the end.