Ed falls for a girl he meets after hearing her playing the piano in a bar in Las Vegas. While they are out together Ed is knocked unconscious and the girl disappears. Ed, Ironside and the team try to figure out the mysterious circumstances behind her disappearance.

Mark encounters a group of freedom fighters at his local college, who appear to have more attitude than sense. When it turns out that they also have a roomful of stolen automatic weapons, the Chief has to decide whether or not they represent a threat to the security of San Francisco.