Destiny United (Shadows of Destiny)

Erin Bolton knows her former foster sister is a sorceress and a witch, but she wants nothing to do with that world. The day before her twenty-first birthday, a terrifying vampire, Marcelo, steals her from the predictability of her secluded life and drags her into the middle of a dangerous war between supernaturals. Adventures and surprises await them both as they travel to the safety of the Underworld. As she struggles to adjust, she begins to wonder, who will keep her safe from the mysterious vampire who claims she's his?