Twenty-two-year-old Erin Rose wakes up one morning with no memory of her past. She's in a strange apartment with only one clue: a vampire bite scar on her neck.Determined to unravel the mystery of her true identity, she contacts the Spectavi vampires, who drink synthetic blood. When they can't help her, she turns to the Sanguans, who feed on humans. Her investigation leads her deep into a centuries-old vampire war.Erin must decide how far she's willing to go to learn the truth about her origins.