A bunch of high school boys gang rape this gal at a party which gets out of control. A few years later, she methodically tacks them down one by one and puts a bullet in them. Clint, the detective, is in hot pursuit of these multiple seemingly random murders and discovers the link just before she kills the last guy, the only one of the group who had turned into a semi-worthwhile human being. He tries to buy her off to no avail.
Clint arrests her shortly thereafter, hears her side of the story, tosses the murder weapon into a trash can and lets her go.
Sudden Impact.