Eileen reflected for a moment, then she addressed Westenhanger directly.

“There’s just one other thing I don’t quite understand. Out on the headland, you said you’d made certain about the matter after you met me there. That means you weren’t quite sure before. What did you mean by that?”

Westenhanger laughed.

“That’s obvious, too. Don’t you see it now?”

The girl went over in her memory the talk which she had had with him half an hour previously; but quite evidently it suggested nothing to her mind as a solution.

“No,” she admitted at last, “I can’t think of anything.”

“It’s simple enough. Think of the things I did; don’t bother about anything I said to you.”

After a moment Eileen recalled something.

“You offered me a cigarette.”

“Yes. I held the case so that you could reach it with either hand; but you used your right hand to pick out the cigarette.”