Ron Kobeleski, an out-of-work TV news cameraman, may have just stumbled onto the story of a lifetime. His shadowy older neighbor, Walter Ohlinger, has summoned over Ron and his camera, saying he's got a secret to reveal. What's the big secret? Walter claims he was the "grassy knoll gunman" - the second assassin of President John F. Kennedy. Is he telling the truth? As Ron and Walter search for the only witness who can back up the story, the pressure mounts and their lives begin to unravel.