At eleven (precisely at eleven, for the kitchen clock struck), the sitting-room bell rang.

Susan Grant entered the room, and found Miss Loach seated in her chair exactly as she had left her, even to the fact that the cards were in her lap.

But she had been stabbed to the heart with some sharp instrument and was quite dead.

The front door was closed and the windows barred.
"Now it is certain that Miss Loach met her death between the hours of ten and eleven.

Susan Grant saw her alive at ten, seated in her usual chair with the cards on her lap, and at eleven, she there found her dead, still with the cards.