"What did I say about her evidence at the inquest?"

"Don't you remember? When I cited her and John Cavendish as being
above suspicion?"

"Oh--ah--yes." He seemed a little confused, but recovered
himself. "By the way, Hastings, there is something I want you to
do for me."

"Certainly. What is it?"

"Next time you happen to be alone with Lawrence Cavendish, I want
you to say this to him. 'I have a message for you, from Poirot.
He says: "Find the extra coffee-cup, and you can rest in peace!"
' Nothing more. Nothing less."

" 'Find the extra coffee-cup, and you can rest in peace.' Is that
right?" I asked, much mystified.

"Excellent."

"But what does it mean?"

"Ah, that I will leave you to find out. You have access to the
facts. Just say that to him, and see what he says."

"Very well--but it's all extremely mysterious."

We were running into Tadminster now, and Poirot directed the car
to the "Analytical Chemist."