Harry thought about how to answer her question as he directed the car back onto the road and towards Burger King. "Well," he said. "I don't have exactly the answer to that. I've got theories, and they feel right, but that's the best I can do." He got his thoughts in order. "There's a Hellmouth. It's not completely open yet, but the Slayer of our time is still indisposed. To be frank, any number of beings could have decided there needed to be a balance between the Hellmouth and the Slayer, and brought you here. Or at least searched for a Slayer to bring."