She did not understand what he was laughing at.

Everything her father did inspired her with reverence and was beyond question.
"Everyone has his Achilles' heel," continued Prince Andrew.

"Fancy, with his powerful mind, indulging in such nonsense!" Princess Mary could not understand the boldness of her brother's criticism and was about to reply, when the expected footsteps were heard coming from the study.

The prince walked in quickly and jauntily as was his wont, as if intentionally contrasting the briskness of his manners with the strict formality of his house.

At that moment the great clock struck two and another with a shrill tone joined in from the drawing room.