A ninja

It was late at night, you'd had a rough day and were finally on your way to relax in your private quarters. You opened your door and that is when you saw her. Almost perfectly disguised in the near-dark of your chambers, clothed completely in black with your drawers open and several documents in her grasp.
You both quickly recovered from your shock and immediately pitched battle. Things did not go well for you; you were near exhausted, running on adrenaline and she was almost super-humanly agile and fast. Thankfully the commotion had gotten the attention of the guards and they helped you take her down.

While she was being taken to the cells, you congratulated yourself silently. Ninja were trained in the martial arts and espionage their whole lives and it was exceedingly rare for one to be bested in a fight, never mind taken alive. Even should she prove resistant to **** and useless for gathering information, she was still quite the prize.
Would you like to see what lies beneath the mask?