private detective
PI
private eye
private investigator
operative
shamus
sherlock

Time was when private eyes were anything but thinking men.

Any private eye wants to play ball with the police.

But not as easily when people know I'm a private eye.

This showed I was a still a pretty good private eye.

A minute later, the private eye walked from the building toward the car.

Didn't look like any private eye Harry had ever seen.

I'll play private eye for three days, and I'm out of here.

"It could have been the office of a private eye."

Wonder if I can get a job after this as a private eye.

West was one of the first female "private eyes" to ever appear on television.