He shivered, seeming to call up a memory that unnerved him. "I saw Dixon in town one weekend, and when I came back, he was talking about what he'd just done with some girl. Here, at the school. So how was it he was in two different places at once?"

I released a breath that caught in the frigid air, my mind whirring, and then sticking on a horrific thought. "But if someone looked like him while it was his turn to guard the stone - "

"No. There are too many charms, ...