Full plot

A woman is sat in a dark, small room being interrogated by a unknown figure. The only thing you can make out about the figure is its silhouette. Her hands are tied behind her back and she looks bruised and battered. The whole way in which she is acting suggests that she's weary and tired, as though she's just woken up after a day or two of being knocked out/sleeping. A bright lamp is the only source of light in the room and it shines bright into her face so that he cant identify the person asking her questions etc. She pleads to be let go and asks what he wants with her, as she cant remember anything. After a few details of the days previous she has a sudden realisation as to what happened and flashes back. This then revels what brought her to be in the room and explains everything to the viewer. The flashback starts with a normal day. She is walking out of the house, yet starts to feel uneasy, as if someone is watching her. She looks round but cant see anyone, and carries on. The shot cuts to a point of view shot to make it look as though someone is watching her. She starts walking down the street when she notices someone behind her, walking at a fast pace. She crosses the road to try and decide whether or not the person is following her, but they also cross the road. This is when she starts panicking. She runs to a nearby woods to try and get shelter, but it all backfires and the person finds her. She falls over a branch and the person soon catches up. they say 'I know what you did...' and proceeds to drugging her so that she blacks out and then wakes up. She pleads it wasn't her and says she didn't do it. After countless acts of torture in an attempt to get something out of her, a realisation suddenly dawns on her. The film then cuts back to a scene of the woman as a young girl, and it reveals certain characteristics of her childhood. The main thing it reveals is the fact that she has a twin sister. It reveals that she was always overpowered by her, and her twin sister shows characteristics that suggest she could grow up to be a bad character.
They grow apart and start to lead seperate lives, with no contact being made for years. Its not until now that she understands whats happened and goes on a mission to find her. With the backup of the person who kidnapped her, she searches everywhere. Finally they find her but the main character cant bring herself to hurt or do anything to he sister, as she feels bad for betraying her own sister. In the end the kidnapper kills her sister.