Page:The Big Four (Christie).pdf/233

 “Excellent, mademoiselle. We will have this analysed immediately. If you will return here in, say, an hour’s time I think that we shall be able to dispose of your suspicions one way or another.”

First extracting from our visitor her name and qualifications, he ushered her out. Then he wrote a note and sent it off together with the bottle of soup. Whilst we waited to hear the result, Poirot amused himself by verifying the nurse’s credentials, somewhat to my surprise.

“No, no, my friend,” he declared. “I do well to be careful. Do not forget the Big Four are on our track.”

However, he soon elicited the information that a nurse of the name of Mabel Palmer was a member of the Lark Institute and had been sent to the case in question.

“So far, so good,” he said, with a twinkle. “And now here comes Nurse Palmer back again, and here also is our analyst’s report.”

Both the nurse and I waited anxiously whilst Poirot read the analyst’s report.

“Is there arsenic in it?” she asked breathlessly.

Poirot shook his head, refolding the paper.

“No.”

We were both immeasurably surprised.