Timed to coincide with the 40th anniversary of the 1978 Jonestown mass murder-suicide that killed more than 900 Americans, this four-part documentary tells of leader Jim Jones' transformation from charismatic preacher and civil rights advocate into narcissistic demagogue who championed the biggest mass suicide in U.S. history. The story is based on the best-selling book by investigative journalist Jeff Guinn and features archival footage -- including secret FBI and CIA recordings, unreleased photographs, personal letters and previously classified documents -- as well as new interviews with survivors and Jones family members who have not previously spoken on the record.