The Ruby Circle is Richelle Mead's final book in the Bloodlines series, and could (potentially) be the last book in the Vampire Academy world. 
 I'll admit that I was apprehensive to begin this book due to the fact that Mead's vampire books have been a part of my life since I was a sophomore in High School - so I have a large soft spot for both VA and Bloodlines. 
 I think that the Ruby Circle was...good. It wasn't really what I expected and I'm sure that there were things that could be changed for me to like it "more" but at the end of the day it was a relatively happy ending for a series that I genuinely care for. So I honestly can't complain. I love the relationship between Sydney and Adrian and am very pleased with the way that Mead handled them. I also loved reading about Rose and Dimitri - I thought that was a very sweet treat. 
 :)