The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Mysterious Affair at Styles by Agatha Christie:|
all the tumult and noise next door Mademoiselle Cynthia slept.
That admitted of two possibilities. Either her sleep was
feigned--which I did not believe--or her unconsciousness was
indeed by artificial means.
"With this latter idea in my mind, I examined all the coffee-cups
most carefully, remembering that it was Mrs. Cavendish who had
brought Mademoiselle Cynthia her coffee the night before. I took
a sample from each cup, and had them analysed--with no result. I
had counted the cups carefully, in the event of one having been
removed. Six persons had taken coffee, and six cups were duly
found. I had to confess myself mistaken.
The Mysterious Affair at Styles