Mirage - Kristi Cook

Danger looms large in the sequel to Haven, which Booklist called "a blend of the Gemma Doyle trilogy, the Twilight saga, and Lois Duncan's thrillers."
Violet McKenna is back for her senior year at Winterhaven and thrilled to be with Aidan after a long summer apart. But while their love for each other is as strong as ever, their troubles are far from over.
News of a rogue vampire on a killing spree sets everyone on edge. While Aidan is determined to stop the killer, Violet is chilled by a horrifying vision she simply must prevent...for if she can't, two people she loves will meet a violent end.
In the midst of Violet's fear, a mysterious newcomer enters her life--and he has some vital information not just about her past, but about her future as well. Now everything Violet held as truth is upended, and she is left not knowing whom to trust, if she is in danger, and--worst of all--whether she and Aidan are really meant to be together.