Due to childhood hurt every day suffering from agoraphobia, housing in the rental house does not go out, cut off the contact with family and friends, to communicate with anyone, all the necessities of life are the small supermarket door-to-door or online shopping, she did not open the door, always let the courier or the deliveryman will wrapped on the outside, from under the door will plug money out payment. But she was still looking at a little bit of a psycho supermarket. This evening, the supermarket clerk was sick, was forced to go out every day to buy necessities, but on the way home was attacked. When she woke up, she found herself trapped in a closed chamber, and then she found out that there were other people too.