“Its effect on Sir Eustace?”

“Yes.”

But, even as I said it, a doubt assailed me. Was it Sir Eustace who had been subjected to a test, or had the story been told for my benefit? I remembered the impression I had received on that former night of having been deliberately “pumped.” For some reason or other, Colonel Race was suspicious. But where did he come in? What possible connection could he have with the affair?

“Who is Colonel Race?” I asked.