Agatha Mary Clarissa Christie, Poirot Investigates (1924)
“ And then there was the coffee. It was very black coffee." "Well, what of it?" "Very black," repeated Poirot. "In conjunction with that let us remember that very little of the rice soufflé was eaten, and we get—what?" "Moonshine," laughed the doctor. "You're pulling my leg." "Never do I pull the leg. Hastings here knows that I am perfectly serious." "I don't know what you are getting at, all the same," I confessed. "You don't suspect the manservant, do you? He might have been in with the gang, and put some dope in the coffee. I suppose they'll test his alibi?" ”
