Quotation from: The Gods of Mars

Written by: Edgar Rice Burroughs

"I know not," replied Xodar. "He was here even as you entered. I
am not his keeper--go find him."

The black grumbled something that I could not understand, and then
I heard him unlocking the door into one of the other cells on the
further side. Listening intently, I caught the sound as the door
closed behind him. Then I sprang once more to the top of the
partition and dropped into my own cell beside the astonished Xodar.