Marcus isn't an ordinary 13-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.