Only Almost?

"Yes. Fly." The 14th Prince's voice entered the spy's ears. "Do you not find them annoying? Always buzzing about; being in places they shouldn't be in... Listening to things they shouldn't be listening to?" 

"Y-your highness?" 

"I sure do. Especially the human sized fly standing next to that window over there. It's even wearing black robes like it's a person. Isn't that annoying?" 

Hearing the prince's words, the spy's heart immediately sank. I was discovered? She thought in shock. Such a thing had never happened before, after all. Even people far stronger than the prince hadn't been able to detect her spying on them, but he was able to? How did he do it? 

"I know you're there. Come in, why don't we speak face to face?" The young prince's voice appeared in the spy's ears once more.