Dead Line

This story with a suspense thriller plot.A beautiful couple named Julie and Robert goes for a long drive on the highway On the way. Robert gives a lift to a beautiful girl named Moni, which Julie doesn't like.Julie does not like the interest he is showing in Moni .Julie's boring and demonic demeanor of Moni she is a bit frightening.What is the reason ,why Robert and Julie kills by moni? Why is she angry with both of them?It is revealed in a heart touching flash back.