[Annu just laughs -- is it intentionally creepy or is that just how she sounds? -- and steps into the room.]

And here I thought you'd be more upset if I startled you. You seemed very intent in your studies.

[She spots which book that is as she approaches, and she frowns.]

Of course they took that too. I'm sure the Professor has noticed it's gone by now. And here I'd covered my tracks sneaking it out.

[He definitely already knew.]