The author analyzes Ted Kennedy’s 1969 car accident and Mary Jo Kopechne’s death, offering a new theory about what happened that night: there was a third person in the vehicle at the time of the accident (Rosemary Keough), and neither Kennedy nor Keough knew that Kopechne had drunkenly climbed into the car and passed out. The author has a PhD in physics and bases many of his conclusions on the physical evidence of the case. He also consults court transcripts and police interviews.