More Than We Can Tell is a companion novel to Letters to the Lost. It lives in the same universe, contains some of the same characters, and the story takes place after the events in Letters to the Lost but it is not a sequel in the normal sense of the word. And for that, I admire Kremmerer that much more. She's written a story that stands entirely on it's own, contains characters that are rich and nuanced, and leaves readers wishing for more. A story about Matthew would certainly be intriguing.

I always want more when I read this authors books. She makes you care about the characters and you want to understand how they got to be the person they are today. It is the same with Rev and Emma. How did they get here and where will they end up. Can't wait for this authors next book.
Goodreads

I loved this book about Emma & Rev just as much as I did Juliet’s and Declan’s story. I was even a bit surprised by twists in the predictions I had made about a couple of situations.