One of our undercover men phoned in the report a couple hours ago.

If they could be trusted, they'd make great undercover men.

I guess I wasn't cut out to be an undercover man.

"I've always been one of your most trusted undercover men," I said.

Every ship probably has an undercover man who's being left behind.

He walked outside and found the other undercover man on the sidewalk.

"You know how close you've been to being a dead undercover man?"

If it is, get an undercover man in there as a porter or something.

The undercover man called in earlier and said he never showed up to meet him after the deal went down.

Now an undercover man, he walked a beat for more than a year.