Confusion 1 part 1: Miriam

Miriam goes to visit Paulina; she hasn’t seen her for ages. They sit down to watch something on the telly. Miriam asks Paulina if everything’s all right and what she’s been up to, and Paulina replies that everything’s been very quiet. just then she receives a message; she doesn’t say who it’s from, but she seems a bit flustered. She grabs something from the drawer and tells Miriam not to open the door to anyone other than herself. Miriam, confused, stays put. A few minutes pass and there’s a knock at the door; she innocently thinks it’s Paulina who’s forgotten something, but it’s a man who asks if this is Paulina’s address, and she replies that it is, at which point he points a gun at her and starts demanding that she hand over a USB stick that she has. But, confused, she tells him she doesn’t know what he’s on about, that her name is Miriam, and that Paulina has gone out and hasn’t come back. He tells her to look for a USB stick here, and quickly, as it’s very important. She searches without knowing what he’s on about, and when she can’t find the USB stick, he gets very angry and starts to strangle the supposed Paulina, who is already dead. He calls his boss to explain that part of the job has been done and Paulina won’t be interfering any more, but when he sends the photo as proof of the job, he realises it isn’t the one he was looking for and now he has to wait for the real Paulina