" As he passed a hand over his eyes, I recalled the he could not have slept more than twenty hours in the last seven days. For the first time since I had known him, Sherlock Holmes appeared to be exhausted by work rather than inaction.

"Because if I am right," he murmured, "I haven't the first idea what to do. "

― Lyndsay Faye , Dust and Shadow: An Account of the Ripper Killings by Dr. John H. Watson