I don't like cliffhangers nor open endings, so I am suffering right now (view spoiler)[because I don't know how Graham and Ellie will do in the end (hide spoiler)]. This one is too open for my taste, hence three stars... for the suffering. 
 I kind-of like the story, the setting, the plot and, at times, the characters, but both main characters sound awfully adult for a couple of teenagers. They might sound as teens in the dialogues some times and in the e-mails, but the narration was a bit too... I don't know... ?serious? If it were about two people in the late twenties or something like that, the book might have gained in credibility and I would have grown fond of it and its characters. Now it's just ok. I enjoyed it, because I was looking for something like that, but it wasn't great, and ever if I think The Statistical Probability of Love at First Sight was good, enjoyable, cute, but lacking, this one is less good, less enjoyable, less cute and more lacking. A pity... 
 In any case I look forward to reading more by Jennifer E. Smith. I think she can create very cute stories. I hope the next one turns out better.