"Your guardian doesn't seem to have taken good care of you child. We must alter that."
The queen's motherly instinct gets the best of her at the end of the story. She takes pity on Kit's destitute and somewhat bedraggled state, determining to have the girl looked after properly. Kit has found the maternal figure which she's been lacking all these years. This is a particularly redemptive moment in the plot.
"You're my jailor."
After Anthony ties Peter up for asking too many nosy questions, he seems puzzled about his next step. Anthony's not the brightest guy, so he tries to make friends with Peter. Having none of it, Peter reminds Anthony that the circumstances prevent a certain level of civility. They are enemies, not allies, and should behave as such. This is another reflection of Peter's change of character, as he's looking to responsibly handle situations with the seriousness they deserve.
"The results are unreliable. Men say anything on the rack; they're apt to accuse the innocent as the guilty. It's better to watch and wait till you know everything."
Cecil is a wise old man, trained many years in his profession. He knows better than to indulge youthful impulse. He wants to have all the information possible before making his first move. While this makes him successful at his job he infuriates the much younger members of his team.
"I bet it means a great deal more. The question is, what exactly? More treason, if I know anything."
This quote perfectly explains the book. There's always something more happening beneath the surface. As Kit observes, the note she and Peter find implies much more than it says. She's smart enough to realizes when she's being fooled.
