Following on from Marked, Betrayed is the second in the House of Night books.
Like Marked, I totally fell in love with this book. It follows on from the events of Marked, delving deeper into a mystery. This time however, humans are being attacked and Zoey and her friends are pulled into the darker side of the House of Night. It gets even darker though when Stevie Rae is killed - leaving Zoey without a best friend.