Narrative for Thriller Opening

Screams are heard over a black screen, they get louder and bridge into the screeching of the DLR on the tracks. A man is sleeping inside one of the carriages, in the third row from the front. He wakes up and exchanges a few ambiguous words with an unseen stranger sitting next to him. This second character is never shown fully and remains a mysterious figure for the audience. The first character turns to look out of the window, and when he looks back, the man is gone. The train doors shut and the second character is shown leaving the train. The first character notices a book that has been left on the seat next to him by the mysterious man. He opens it and it contains a piece of paper with the name of the station where he presumes he is supposed to get off, consequently it is the one approaching. He exits the train and asks a man on the platform for the time, who replies ‘yeah, you’re late, red hat’ suggesting he isn’t a stranger and is fully aware about what is going to happen. The first character looks around the platform, and turns back to the man, who is already gone. He then notices three men leaving the station, one of which is wearing a red arsenal hat. He also notices a young girl, mid-teens, wearing a red hat, leaving the station. He takes his chances and decides to follow her. She doesn’t realise and walks on; it is getting darker by the minute. She crosses a dark street and the man drags her down an alley. The screams from the beginning are played again, and the screen fades to black.