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The series Bloodlines, by Richelle Mead, is a follow up series to the series Vampire Academy. It is taken from Sydney Sage's perspective instead of Rose Hathaway's.
In the first book, a Moroi princess is almost killed by assassins who want to end the queen's rule. The princess is hidden in human society by the Alchemists. Sydney Sage (an Alchemist) and another Alchemist are sent with the princess to supervise her, along with Eddie (a Dhampir) and Adrian (another royal Moroi).