This is the first book I've read in the series (it was on our new shelf at the library), and it is so charming! It is written in letters, emails, and newspaper clippings, which is a style of interest to me because of the popularity of "diary" books. The series revolves around three main characters who live in an old mansion, Ignatius (Iggy) Grumply; Seymour, a young boy; and Olive, who is a ghost. They live without modern technology, and Olive writes stories that are solely delivered by snail mail and are immensely popular (there is a certain excitement in getting real mail, that's for sure).
In this book, the post office is being forced to close, in hopes to be replaced with a faulty technology called VEXT-mail (it's a veil), which Olive is very against. Another mysterious character is also against the move to complete virtual/digital service and begins writing letters to Olive from post office box 5 signed as the Phantom (play on the Phantom of the Opera, which I had the privilege to see in the 7th grade in SF).
I just love all the humor in this book: the names of the characters and word play are nerdtastic. This is also a good book to explain to children about technological changes and how not all people have fancy gadgets. As a public library staff person/reference librarian at a small community college, the digital divide is definitely alive.