Three girls alone at night are having fun since their parents are out of town. After trying their hand at various games, they are looking out for something more exciting to play with. One of the girls comes up with a game wherein they randomly are to call people and tell them, "We know who you are, & we saw what you did." After a couple of fun calls they end up making a call at a house where a man has just killed his wife. Unfortunately for them , the man has a caller id facility and is able to trace the girls' whereabouts. He lands up at their doorstep...
What follows next is like a terrifying nightmare for the girls, eventually forming the crux of the plot in this suspense thriller.