What is your favorite L.J. Smith book?

L.J. Smith is one of my favorite authors. She has a unique way of writing that draws me into the story. I think about the characters long after I stop reading. It is hard for me to pick my favorite series because I love them all so much. If I had to pick, I think I would say the Night World series. I’m fascinated with the soulmates principle. I also like how this series has a different story in each book but also connects to a larger story. I can’t wait for Strange Fate to be published.
I also really liked the Vampire Diaries. I enjoy the show, but the book is totally different and better. Damon is my favorite character. I am so disappointed that the series is now ruined. L.J. Smith will not be allowed to write anymore Vampire Diaries. It was taken from her and given to a ghostwriter. She has fought long and hard to prevent/reverse this decision, but Alloy (the book packaging company) will not budge. This was allowed to happen because of a “work for hire” clause in the original contract she signed in the ‘90s when she really didn’t understand what it meant. Midnight was written fully by L.J. Smith, and when she wrote it she thought she would be continuing the series. The next book, Phantom, was written by L.J. Smith, but the publishers told the ghostwriter to rewrite it. However, it will still say “Created by” L.J. Smith. I won’t be buying it because a) I don’t think it will be any good and b) I think it was very underhanded move by Alloy to do what they did.
What is your favorite book/series by L. J. Smith? What is your favorite thing about that book/series?