Text: I presume Mrs. Inglethorp took the coffee after dinner about eight o'clock, whereas the symptoms did not manifest themselves until the early hours of the morning, which, on the face of it, points to the drug having been taken much later in the evening."
Entailment: I assume Mrs. Inglethorp drank the coffee at night time.
Contradiction: I assume Mrs. Inglethorp drank the coffee with breakfast.