You are not, then, Lieutenant von Kaphengst ?" Kaphengst thought a moment.

He was convinced it was the king that spoke with him, for Frederick had not attempted to disguise his voice.
Kaphengst knew he was discovered.

There remained nothing for him but to try and reconcile the king by a jest.
He bowed close to the king, and whispered: "Listen, mask--as you have recognized me, I will acknowledge the truth.

Yes, I am Lieutenant von Kaphengst, and am incognito.

You understand me--I came to this ball incognito.