Pretty much like the tittle said.
An attractive man enters a public place: bar, coffee shop, cinema, bank...makes sure to hide his face from the camera and then spots a lone girl. He sits next to her and makes a conversation. After a few moment of hesitance, she opens to him. He seems to be a nice charming guy. Then all of a sudden he pulls out a gun, kills some guys and asks for everybody to be on the floor. He shots the bartender/waiter/... because the guy has seen his face clearly. She's the second person who knows his face, but he doesn't shot her, he takes her away with him.
I have a few more thoughts in mind but don't want to give too much just yet, so please pm me (I don't check the thread) if you're interested and please read the link in my sign for my O&O and other things.