“Yes.”

Poirot went next to the window.

“The electric light was on, of course, when you discovered the body?” he asked over his shoulder.

I assented, and joined him where he was studying the marks on the windowsill.

“The rubber studs are the same pattern as those in Captain Paton’s shoes,” he said quietly.

Then he came back once more to the middle of the room. His eye travelled round, searching everything in the room with a quick, trained glance.

“Are you a man of good observation. Doctor Sheppard?” he asked at last.

“I think so,” I said, surprised.