Ten Years Later: The Vicomte of Bragelonne by Alexandre Dumas Chapter 28 Page 19

“Oh, heavens!” repeated Charles, “oh, heavens! do you speak the truth, monsieur? Are you not insulting me with some unworthy joke? You have accomplished this unheard-of act of audacity and genius — impossible!”

“Will your majesty permit me to open the window?” said D’Artagnan, opening it.

The king had not time to reply yes or no. D’Artagnan gave a shrill and prolonged whistle, which he repeated three times through the silence of the night.

“There!” said he, “he will be brought to your majesty.”