Spirit Bound (2010) by Richelle Mead is the penultimate book in the Vampire Academy series, following 19-year-old Rose Hathaway’s journey as a dhampir guardian in training. After believing she had killed her former lover Dimitri Belikov, who turned into a strigoi (undead vampire), Rose receives a mysterious letter from him, filled with love and death threats. With the help of her best friend Lissa, Rose embarks on a dangerous quest to reverse Dimitri's transformation. As she faces perilous challenges, including breaking into a vampire prison and confronting Dimitri, the story builds to a cliffhanger when Rose is framed for the murder of Queen Tatiana. The final book resolves the political intrigue and romantic tension, ending with Rose and Dimitri's reunion and Lissa's ascent to the throne.