Our landlady, Mrs. Pearson, at once informed us that a hospital nurse had called and was waiting to see Poirot.

We found her sitting in the big arm-chair facing the window, a pleasant-faced woman of middle age, in a dark blue uniform. She was a little reluctant to come to the point, but Poirot soon put her at her ease, and she embarked upon her story.

"You see, M. Poirot, I've never come across anything of the kind before. I was sent for, from the Lark Sisterhood, to go down to a case in Hertfordshire. An old gentleman, it is, Mr. Templeton. Quite a pleasant house, and quite pleasant people. The wife, Mrs. Templeton, is much younger than her husband, and he has a son by his first marriage who lives there. I don't know that the young man and the step-mother always get on together. He's not quite what you'd call normal—not 'wanting' exactly, but decidedly dull in the intellect. Well, this illness of Mr. Templeton's seemed to me from the first to be very mysterious. At times there seemed really nothing the matter with him, and then he suddenly has one of these gastric attacks with pain and vomiting. But the doctor seemed quite satisfied, and it wasn't for me to say anything. But I couldn't help thinking about it. And then—"

She paused, and became rather red.

"Something happened which aroused your suspicions?" suggested Poirot.

"Yes."

But she still seemed to find it difficult to go on.

"I found the servants were passing remarks too."

"About Mr. Templeton's illness?"

"Oh, no! About—about this other thing—"