Circle of Fire by Keri Arthur.
Sixteen teenagers taken from their homes. Eleven bodies recovered, each completely drained of blood. Some believe vampires are responsible. Jon Barnett knows its something far worse, and while in Taurin Bay to stop the killers, he quickly becomes enmeshed in a web of black magic. He needs help but fate gives him only one choice. Madeline Smith has retreated to an isolated farmhouse, afraid of the abilities she cannot control - abilities that have killed. But when a 'ghost' brings a warning of danger and her nephew goes missing, Maddie has to leave her haven and learn to control the abilities she fears. As Maddie and Jon's search for the teenagers becomes a race against time, the greatest danger to them both could be the feelings they refuse to acknowledge.
Will read and review this at a later date.