“While Mrs. Kettering was telling you this, where was the gentleman?”

“He was standing in the other compartment, sir, looking out of the window.”

“Can you describe him to us?”

“Well, you see, sir, I hardly saw him. He had his back to me most of the time. He was a tall gentleman and dark; that’s all I can say. He was dressed very like another gentleman in a dark blue overcoat and a grey hat.”

“Was he one of the passengers on the train?”

“I don’t think so, sir; I took it that he had come to the station to see Mrs. Kettering in passing through. Of course he might have been one of the passengers; I never thought of that.”

Mason seemed a little flurried by the suggestion.