"But mostly you work for ladies of, shall we say, negotiable affection?" said Vimes. Lawn gave him a sharp look to see if he was joking, but Vimes's expression hadn't changed.
"Not just them" he said. "There are others."
"People who come in by the back door," said Vimes, looking around the little room. "People who for one reason or another don't want to go to the . . . better known doctors?"
"Or can't afford them," said Lawn. "People who turn up with no identity. And you had a point . . . John?"
"No, no, just asking," said Vimes, cursing himself for walking right into it. "I just wondered where you trained."
"Why?"
"The kind of people who come in by the back door are the kind of people who want results, I imagine."
"Hah. Well, I trained in Klatch. They have some novel ideas about medicine over there. They think it's a good idea to get patients better, for one thing."
-- Night Watch