"She was a demon," Sam says bluntly. His stomach twists yet again with that uncomfortable feeling of betrayal, the sensation laced with a humiliation Sam is almost positive he'll never really be able to shake.

But it's curiosity now that at least keeps his mind distracted, focusing intently on the woman before him. That's the second time now she's said that word and, though Sam thinks he maybe has an idea of what it might be, he's still not entirely sure. Not even close.

Sam has done a lot of research on nearly every kind of demon and spirit and monster known around the world, but he's fairly sure he's never heard of a Hollow.

"What are they?" he asks, lips curled in an inquisitive frown. "Just angry spirits? Ghosts?"