I think this one is my favorite so far, but it's still 3 stars. The Danny character rubbed me the wrong way, so I was annoyed when they invited him to

come with them on the private plane to England

at the end, although thankfully he mostly faded to the background after that. Kind of a ridiculous ending, but that's pretty on brand for the character. I like that we learned more about Luke and his background in this book, I loved seeing Suze's story progress, and I thought all the new characters introduced at Becky's job were a lot of fun. 

Also, this book “handled” 9/11 by omitting the year on all the dated correspondence (unlike the previous 2 books and at the least the book that comes after this), but I think it’s supposed to take place mostly in 2002, with the earliest correspondence being from November 2001.