I was alone for a few minutes in Room B. I turned off my notifications, opened my notebook, and drew a section of the plaza. Curves like waves, benches like coastlines, a central tree to anchor time. That's when I felt the tingling. Not on my skin. In the air.

Someone was watching.

I turned around. There was no one there. But the reflection in the glass door showed a fragment of a shadow retreating.

"Pablo?" I called.

No answer. I put my notebook away. I went out into the hallway. Nothing. A so