Simply amazing! Full review to come. 
 Update 8/11/13: 
 I am just blown away at how good this book was. I have been a huge fan of the Watersong series since the very beginning, but this just left me speechless. The end of Tidal left me needing this book so badly it hurt, so when I finally received my copy in the mail, all 542 pages of it, I was jumping up and down in anticipation. I couldn't wait to see how everything was going to play out, and what was going to happen to our beloved characters. And trust me, this novel doesn't disappoint. While some might be scared away and worry about the length (and come on...it's virtually a brick), have no fear because you will want to keep reading. I read this in one day simply because I couldn't put it down. I loved every single second of it, and this is truly Amanda Hocking at her finest. This book shows how much she has grown as an author, and if this is any measure, we can expect even greater things from her in the future. 
 The pacing in this novel was excellent. It was never dull or slow or boring. The entire novel was action-packed, suspenseful, and full of lust and love. The mythology of this series has always been one of my favorite parts, and it definitely does not disappoint. We delve even deeper into the Greek myths and siren world that we have come to know and understand. You can tell how much Amanda researched for this novel (and the series in general). The thing I appreciated the most though was how she put her own unique spin on the myths. And don't worry, we get answers to all of our questions, but of course that also always leads to other questions. Even though the reader is given all of the answers, it is spread out through the book and not just dumped on the reader. As such, the reader is never left feeling bored or overwhelmed. You want to keep reading to find out even more, and how everything is going to resolve itself. Because as we all know, just because you find out the answers, doesn't necessarily mean that everything just works out. There's always that one hurdle standing in your way. 
 The characters were fabulous. We got to know more about Penn, Thea, and their history. Harper and Marcy were fantastic, and Marcy was hilarious as ever. She had me cracking up so many times during this novel, and it was a nice lift from the seriousness that was plaguing the characters. Daniel (he's my boy!), while I was furious at after the end of Tidal, more than made up for his actions at the end. While he did have me frustrated many times throughout the book, I still loved him nonetheless. Alex also comes back into the picture, and I was happy to see him more involved in the story than the previous book. However, this was ultimately Gemma's story. She has grown so much as a character, and it was refreshing to read. Not only has Gemma become stronger, but she is more willing to fight for the answers she is so desperately seeking. She never gives up, and keeps going until the very end. I'll warn you now, there are major deaths in this book. 
 Amanda Hocking is an amazing author that has put a unique spin on classic Greek mythology. She is a master craftsman, and I can't wait to see what she has in store for us in future books. This book had me guessing to the very end, and was never predictable. It was full of twists and turns that were both exciting and sad. As I said before, don't be afraid of the length- it just gives you more time to say goodbye to all of the characters that you (and I) have grown to love so much. I highly recommend this series to anyone, and I will definitely be re-reading this series over and over again! 
 5+++++ stars