"If Juliet's memories do prove correct, I don't think this can possibly be the work of a coin," says Sherlock. "Coins are powerful but they're piss-poor at narrative, as far as I can tell; I would be noticing contradictions already. I'd believe enchantment first, and local magic before either. But I shudder to think how much power a local witch would have to put in to get this kind of far-reaching effect. And then there is the question of motive."