Quiet in a shadow library

Mistress: Oh, and there's... huh?
Guard: Excuse me, other guests complaining about you're talking all the time.
Mistress *looking around*: Complain? Maybe sometimes I'm saying something, but I'm quiet, it can't disturb anyone and it helps me in understand what I'm reading when I'm...
Guard: Enough! I'll keep it. To get it back please, go to the reception.