I've read quite a few books with this premise of anonymous writing between main characters and for the most part I've enjoyed them all. Letters to the Lost is no different, except that it's probably one of my favorites in this trope. The more I read, the more I couldn't stop and I really wanted to know how things would progress, both with the MC's as a pair and with their individual storylines. There were a few things I saw coming, a couple that really surprised me, so overall, this book just kept me engaged and wanting more. 
 As far as the characters go, I liked Juliet and Declan enough. They both had something terrible happen to them, so they've grown a very tough exterior, but you can tell these two are going through a lot of pain. I liked how Kemmerer broke down everything and we really got to know each character and I connected to them easily, despite not ever having experienced what either went through personally. There were moments where I wanted to knock some sense into them, especially with Declan and how long it took for him to get to a more stable place in regards to his family situation, but the tension felt real and I understood why it took as long as it did. 
 I think I enjoyed Juliet's journey a bit more than Declan's. While their individual problems have some aspects I've seen before (i.e. family members that have passed away and the emotions related to that), Kemmerer dealt with it in a unique, yet believable way and that really drew me in. It was interesting getting to know Juliet and seeing her views about her mother and such. Declan's story has more ups and downs and has more drama, yes, but I don't know, Juliet's was more emotional and I guess I was feeling that at the time. Their progression as a pair was fun to read and I liked reading their messages to each other and watching them fall for each other. 
 I liked this book way more than I thought I would. Towards the end, I basically couldn't stop reading. I just think Kemmerer wrote this book so well and it's not only fun to read, it's emotional, entertaining, and has an array of characters, all dealing with different things, yet connected in various ways that created such an amazing story. I'd definitely recommend this book and this is easily my favorite book from the author so far.