The story of Chappaquiddick is not only about Ted Kennedy or Mary Jo Kopechne. It was also about the Boiler Room Girls, the women who were Mary Jo's co-workers -- and her friend. Many theories about what happened that night have been explored in this podcast. And in the final episode of Cover-Up, a mysterious letter reveals new details about the story that has been shrouded in secrecy for nearly 50 years. To continue the discussion, join our Facebook group to share your thoughts and theories or reach us directly at [email protected] And for more on the case, go to people.com/coverup. Learn more about your ad choices. Visit megaphone.fm/adchoices

Peel back a layer that you think brings you closer to answers about Chappaquiddick, and you find more questions. What to make of the story of a young girl who witnessed an unusual occurrence on the island the night of Ted Kennedy’s car accident. She has never spoken publicly about that moment -- until now. Hear her story, and that of the man who tried to solve the decades-long mystery but was a complete mystery himself. A man who’s quest for the truth took us down the rabbit hole. To continue the discussion, join our Facebook group to share your thoughts and theories or reach us directly at [email protected] And for more on the case, go to people.com/coverup. Learn more about your ad choices. Visit megaphone.fm/adchoices

The investigation into Chappaquiddick was cloaked in an atmosphere of threats, fear and intimidation. The attempt to have Mary Jo Kopechne’s body exhumed for an autopsy was fought by her parents — and would become their lasting regret. Hear from the experts who testified about Mary Jo’s final moments - and from the last man who tried to find out what happened that night. To continue the discussion, join our Facebook group to share your thoughts and theories or reach us directly at [email protected] And for more on the case, go to people.com/coverup. Learn more about your ad choices. Visit megaphone.fm/adchoices

President Nixon had been in office nearly seven months at the time of the Chappaquiddick accident but he viewed Ted Kennedy as a potential threat to his political future. So he sent his private investigator to dig up some dirt, a man who may have known more about Chappaquiddick that anyone else. Learn about his secret investigation and hear from one of the the Senator’s closest confidantes, whom he called in the early morning hours after the accident. To continue the discussion, join our Facebook group to share your thoughts and theories or reach us directly at [email protected] And for more on the case, go to people.com/coverup. Learn more about your ad choices. Visit megaphone.fm/adchoices

Many people say you can’t understand Chappaquiddick unless you understand the effect of Bobby Kennedy’s death on his younger brother, Ted. The same could be said for Mary Jo Kopechne — that you have to understand the effect of Bobby’s death on her. Learn about the two people at the center of the scandal: the man thrust into a position he never expected, and the woman whose life was cut short before she ever had a chance. Hear from those who knew a side of Mary Jo many didn't get to see, and the surprising theory they all share. To continue the discussion, join our Facebook group to share your thoughts and theories or reach us directly at [email protected] And for more on the case, go to people.com/coverup. Learn more about your ad choices. Visit megaphone.fm/adchoices