"Possession's not the only concern. I recommend just staying away from the, ah why not, let's call it the Escher building. Stay away from there, I think, for the moment." The Doctor's expression was grave as he spoke.

"Three of us, Jaime, myself, and Scorpius, went in. There's a building with, well, a stone inside. But it's more than a stone, and it wants out. It's telepathic, very old, very powerful, and it has assassins watching over it. We barely made it out."

He scanned the group's faces, trying to impart exactly how serious he was, dangerous the building was. "I do want to explore further; there's something else trapped too that might need help. But no one should go in alone, and absolutely no one without me."