Storyline/synopsis for film noir opening

It starts with a group of teenagers making their way to a house party, they get to the house and begin drinking and having a goodtime, one of the teenagers starts a fight with another teenager and everyone tries to stop if, the fight turns into one big brawl, as the brawl stops the teenager that started the fight falls to the floor after being stabbed, a girl screams and the party stops, everyone runs and scatters away from the house, all but the owner of the house and the person who the fight was with, at the end you hear sirens coming and fear is struck in the face of all that are there