I frowned, and then she glanced towards the master: whose mind was occupied on other subjects than his company, as his countenance evinced; and she grew serious for an instant, scrutinizing him with deep gravity.
There are no more uses of "scrutiny" in the book.
Show samples from other sources
She scrutinized her reflection in the mirror.
The senator asked the agency to scrutinize the proposed legislation and report back to her with their findings.