Ariella Montero is a sweet, sensitive 13-year-old girl from Saratoga Springs. Unbeknownst to her, she is also a vampire. Raised by her widowed father, Ari is told she has a weak immune system and should stay away from crowds. When she learns that her father is also a vampire and that her mother may not be dead at all, she embarks on a journey to discover the truth about herself and her family.