"But surely," said she, "I may enter his county without impunity, and rob it of a few petrified spars without his perceiving me."
There are no more uses of "impunity" in the book.
Show samples from other sources
I must not only punish, but punish with impunity.
Edgar Allan Poe -- The Cask of Amontillado
They spoke of eternal youth enjoyed outside the confines of loops, of jumping back and forth from future to past with impunity, suffering none of the ill effects that have always prevented such recklessness—in other words, of mastering time without being mastered by death.
Ransom Riggs -- Miss Peregrine’s Home for Peculiar Children