The Rolling Stones touch down in San Francisco to play their first gig in the Bay Area since their disastrous concert at the Altamont Speedway three years earlier — when they'd inadvertently provided the soundtrack to a murder. Their arrival forces them to revisit that awful day when members of the Hells Angels, supposedly acting as security, stab 18-year-old Meredith Hunter to death in the middle of the band's set. The Stones hope these new gigs will serve as an apology to the hippest music city in America, but fear that the motorcycle gang will make good on their threats to assassinate Mick Jagger as revenge for Altamont's legal fallout.