“Yes,” he continued, staring at me thoughtfully, “you will be invaluable.”

This was naturally gratifying, but Poirot’s next words were not so welcome.

“I must have an ally in the house,” he observed reflectively.

“You have me,” I protested.

“True, but you are not sufficient.”

I was hurt, and showed it. Poirot hurried to explain himself.

“You do not quite take my meaning. You are known to be working with me. I want somebody who is not associated with us in any way.”

“Oh, I see. How about John?”

“No, I think not.”