This is going to be a long review, so prepare yourself now, but I need to express the amazingness of this book. 
 If I could give this book infinite stars, I would. Heart-wrenching and beautifully written, Sea of Tranquility will completely blow you away, and bring tears to your eyes. This novel was one of the best books I have ever read, and plan to re-read over and over again. From the very first page, you know that you will be taken on an emotional journey that will be thought-provoking and resonate with any reader. 
 I will say, this book does start off a little slow, and by a little, I mean you have to read a good 100 or so pages before you start realizing how utterly amazing this book is. You start to appreciate the subtlety and quiet way this book sneaks up on you, and before you know it, you are so invested in this book that you need to read it nonstop to see how it ends. This novel is so beautifully written that it's difficult to even put in words. There were times where I was on the verge of tears because I felt so connected to these characters, and my heart just broke for them. 
 This book follows Nastya and Josh, both with their own share of tragedy that no teenager should ever face in life. Nastya is a character shrouded in mystery, and you need to keep reading to find out what exactly happened to her that made her the way she is today. And you know what, once you find out what happened, you can't blame her for picking up her life and starting over with a new personality and a new identity. Throughout the novel, Ms. Millay gives the reader little clues here and there about what happened, and you can guess, but I you won't have the whole story figured out. The thing I loved about Nastya was her resilience and tough-as-nails attitude to everyone else, but the reader knows her true fragile nature. Don't get me wrong, she is not frail in anyway, but she is broken in the ways that count. This makes her an easy character to relate and connect to. But she's also hilarious, sarcastic, and witty, and I just adored her character. Throughout the story, she develops relationships with 3 boys, Drew, Clay, and Josh. Each was perfect for her in their own way, and I loved what each guy brought out in her. Each guy helped bring back Nastya, whether she realized it or not. However, Josh was the ultimate person that helped her. 
 Josh was a quiet, kinda-sorta loner that is caring and will fight to the end for the people he loves. He's protective and what every girl wants. However, the thing I loved the most about him was his treatment of Nastya. He allowed her to be her true self, not the person that she portrays at school. He respects her boundaries, and gives her a security that she hasn't felt in a long time. However, there was one point where I just hated him because of what he did after a certain thing happened between him and Nastya. I just wanted to scream and shake him because he acted just like his best friend, Drew. Nevertheless, I forgave him because technically he didn't do anything wrong, and I just loved him even more at the end. 
 In my opinion, the relatable nature of the characters was one of the best things about this novel. Even if you never experienced something terrible in your life (and really, who hasn't), it's a good bet that you know someone who has. Ms. Millay has managed to capture every raw emotion and every thought that a person who has been dealt a hardship in life feels. I felt that I knew these characters as if they were close friends. While not every person (and not even most people) are faced with the same situations that both Nastya and Josh faced, many people can relate to Nastya because who hasn't wanted to pick up, and start over someplace else...with a new identity, and no one to recognize you. Similar with Josh, who hasn't thought that they are cursed in some way because of a certain event that happened, and in some ways you no longer think you are capable of love or being loved. 
 The end of this novel was absolutely heart breaking, and I almost cried at every single page. However, it was also beautiful. The last two words will echo in your mind long after you close the book. I actually went back and re-read the last couple of pages because I just wanted to read the wonderful words one more time before I moved onto my next book. And let me tell you, just when your tears have finally dried, they come back as soon as you read those two words because of the meaning they have. Please don't spoil yourself and read the end for two reasons; one being the obvious, you'll spoil it for yourself and two, you won't actually understand the true meaning behind those words unless you read the full story. 
 I'm going to warn you, this is a slow building story, and it is long, but the story has to be that way. Nothing is rushed, and it gives the story a true feeling to it, from the way Josh and Nastya's relationship develops to just the overall plot in general. Another thing that I want to mention is that this is in no way a tragedy; in fact, it's the opposite. It's about finding yourself and finding love. It's not hardcore romance, but it has romance in it. The author has an amazing writing style, and it is not to be missed. She is gifted, there is no doubt about that, and I am eager to read whatever else she writes. This book is truly unforgettable, and you need to pick it up right away! 
 Just a side note...2 songs were on constant repeat in my head while I was reading this novel, "Demons" and "Every Night" by Imagine Dragons. Both of these songs fit perfectly with the storyline and the characters.