What's that

ANN [calming down; without looking up] What's that?
DOCTOR. Sleep and calm. This will relax you and make Your Highness feel a little happy. It's a new drug, quite harmless. [As he injects her the General faints behind them, unnoticed] There.
 ANN. I don't feel any different.
DOCTOR. You will; it may take a little time to take hold. Just now, lie back, ah?
ANN. Can I keep just one light on?
DOCTOR. Of course. Best thing I know is to do exactly what you wish for a while.
ANN [smiling] Thank you, Doctor.
COUNTESS [the Countess looks round at the General on the floor] Oh, the General! Doctor, quick!
DOCTOR. Oh!
ANN [sitting up] Hah! [she puts her hand over her mouth, covering her smile].
GENERAL [embarrassed; straightening his bedrobe] I'm perfectly alright. [To the Princess] Goodnight, ma'am. [He bows and leaves].
DOCTOR [bowing, smiling at the Princess] Goodnight, ma'am.
ANN. Goodnight, Doctor. 
The Doctor leaves, followed by the Countess, who turns off the light and, looking back at the Princess, shuts the door behind her.  Alone, the Princess