You're in the detective business, and you've been around a lot and seen lots of people.
"The private detective business is slow this summer," he said.
But he still took a professional interest in the detective business.
You know, I think you're getting the hang of this detective business.
I'm fed up with the detective business, and I'd like to quit.
"Where'd you go to school, that sort of thing, and how you got into the detective business."
Then you've come up with what we in the detective business like to call a genuine lead.
But as you pointed out to me only this afternoon, how hard could the detective business be?
If being cool was the first rule of the detective business, don't panic had to be the second.
This detective business of waiting about is too much for my French impatience.