Birth of a Killer by Darren Shan

When terrible events force young Larten Crepsley to flee his home he finds himself alone in the world. Then he meets the mysterious Seba Nile, who introduces him to the ways of the vampire clan. Travelling with Seba, Larten experiences the adventures he has always dreamed about. But will he turn his back on humanity and join a world from which there can be no return...?

So begins the blood-soaked tale of a vampire who starts out a nobody...but will change the world forver.