This was news to me and glancing sideways at Poirot, I fancied that it was news to him as well.

There was the faintest pause, the mere hesitation of a moment, before she answered:

“Yes, that is so.”

“And the boudoir window was open, was it not?”

Surely her face grew a little paler as she answered:

“Yes.”

“Then you cannot have failed to hear the voices inside, especially as they were raised in anger. In fact, they would be more audible where you were than in the hall.”

“Possibly.”

“Will you repeat to us what you overheard of the quarrel?”