Fred Morrow (Jeffrey Hunter), a real-estate agent who stops by a bar to make a phone call, is a chance witness to a knifing by an L.A. street gang. Upset and conscientious, he picks up the phone and calls the police. Once the men in blue arrive, Fred is the only one willing to testify against the gang members — as usual, no one else has seen anything. From that moment onward, Fred and his family are harassed as the drugged-out gang turns to any means to shut him up or to permanently silence him.