I am disappointed. And it will be my first review with only two stars (I have given two stars earlier but I haven't written full review then). 
 What is good: the main idea, the main thread of the story and the idea about characters. Thanks to these there are a few interesting scenes. 
 But it isn't all used as it could and should be. There is to many descriptions of emotions, hopes, regrets and so on. [I would never thought that I would write it "to many descriptions of feelings", because I think it is one of important things in the books, but...] An author repeated all over again the same things. I was so bored that I skipped many paragraphs. I know, there are authors who write much about feelings (and I like some of them) but when you are doing it you have to do it good. In other case, your book will be... some kind of cheap and rubbishy piece. 
 So, I liked (during reading some parts of books) Grace, Nicholas and Samuel. But then in another parts I have difficulties with acceptance what they did. Not because it was wrong but because it didn't fit to their personalities, in my opinion. 
 By the way, sometimes the hardest thing is don't write about feelings at all and do it in such a way that a reader learns what those feelings are.