Don't believe everything you see.
Back in '47, a gun was a roscoe, a private-eye was a Peeper, and murder was okay as long as nobody got hurt. In fact, anything was okay with this Peeper on the case because he wouldn't know who-done-it even if he done it himself.
It's really no mystery why this girl is MURDER... it's as simple as ABC if you look hard enough!
New York cop. Kicking London arse.