My mother was leaving to go to the store. As she left she said "Don't unlock or open the door to anyone". But my sister didn't listen. So later after she left we made some popcorn and watched a movie. As I turned the tv on we heard "knock knock". But we didn't think anything of it but again we heard "knock knock". I told my sister not to answer it because of what my mom had said. And a third time we heard "knock knock". My sister said "I can't take it anymore I am opening it". So I stayed on the couch watching the previews on the movie. I heard my sisters footsteps walking to the front door. "Who is it?" She asked at the door. When she opened the door I heard nothing but silence so I turned the tv off. I snuck near the door to see if anyone was there but there wasn't anyone near the front door that I could see. I was frightened to call her name, so I tip toed to the back door and knocked on the neighbour's door and we sat and watched the local news.they were just saying boring things until I heard "there is a murder in town". They said that some one was just killed in this neighbourhood. They showed the door of the house that there was a crime at. " hey that looks like your house" my neighbour said. "That is my house" I replied.