Sherlock

— So you're doing well, you've been abroad a lot. Flying all the way around the world twice in a month.
— Go on, enlighten me. Two trips a month, flying all the way around the world, you're quite right. How could you tell? Are you going to tell me there's a stain on my tie from some special kind of ketchup you can only buy in Manhattan? Is it the mud on my shoes?
— I was just chatting with your secretary outside. She told me.