Pete Johnson 
The Vampire Bewitched 

Marcus isn”t an ordinary thirteen-year-old. He has an amazing secret: he”s a half-vampire, with incredible special powers. And together with his friends Tallulah and Gracie, he hunts and fights a totally evil enemy: the deadly vampires, who are out to destroy all humans and half-vampires.
But something strange has happened to Marcus. He”s lost his memory, and can”t remember anything about his previous life as a vampire hunter. Tallulah and Gracie are seriously worried. They think his amnesia is very suspicious and sinister – and might have something to do with the weird new horror shop that”s just opened up in town . . .