Final GirlsTen years ago, college student Quincy Carpenter went on vacation with five friends and came back alone, the only survivor of a horror moviescale massacre. In an instant, she became a member of a club no one wants to belong toa group of similar survivors known in the press as the Final Girls. Lisa, who lost nine sorority sisters to a college dropout's knife; Sam, who went up against the Sack Man during her shift at the Nightlight Inn; and now Quincy,