I've been hunting for one special book for 10 or more years. I only found a few of them in searching through the Internet. I love the series by Elizabeth E. Smith, called the "Miss Melville..."series.
I have all 4 of them except for the last one, called Miss Melville Runs for Cover" and will buy it for new full price, plus postage.
The author died in about 1999, the book was advertised to have been published again about 5 or so years ago, my daughter and I both pre-ordered it and then the publishers decided to not bring it out after all. If you have it, please PM me.