“Was it you?” Dani whispered darkly. Her colors were icy blue, and she was pulsing like a poorly created Rune. “Were you the one that killed them?” The Master looked down at the ground. “I can neither confirm… nor deny that statement. I pledged to never speak of it, and so I cannot deny it without breaking my word.”
goodreads seems to have lost the formatting, deny is italicized which makes it much clearer that he is giving an answer without breaking an oath.