In the early hours of the morning, I was awakened by a dull thud. A sharp knock against the glass. I got up barefoot and opened the curtain. On the windowsill was a chess piece: a wooden knight stained red. I picked it up with two fingers. It was heavy, old, with a slight smell of gasoline.

I wrapped it in a bag and called security. They took a few minutes to arrive. They took photos and collected fingerprints. Eva appeared in her pajamas, her eyes wide.

"What is it?"

"Another threat, I guess."