Sherlock was wandering through the corridors in his bare feet, completely and utterly bored. His dressing gown swirled behind him as he turned a corner. He didn't care where he was going, or whether he was lost or not. He was just bored.
And then he heard the voice. His first instinct was to ignore it, turn the other way and hope the woman hadn't seen him, but then he registered what she had said. Detective. He perked up at the possibility of some interesting problem.
"Did you say you were looking for a detective?" he asked, walking towards her.