When a party bus on its way to Burning Man filled with a bunch of sexy young adults breaks down in the desert and in the middle of a group of Satanic worshippers, all hell literally breaks loose. A massacre leaves seven survivors trapped on the bus, fighting for their lives while wondering if someone or someones are not what they seem.

Lifelong friends Kate (Mamrie Hart), Evie (Grace Helbig) and Charlie (Hannah Hart) are in a rut. Kate spends her days at a middling job and her nights alone or on failed dates. Evie is married with the in-laws from hell, wandering from one charitable cause to the next. Charlie has the girl of her dreams but just can’t seem to pull her business (or her act) together. On the eve of Kate’s 30th birthday, she agrees to let Evie and Charlie throw her a party. But what’s supposed to be a simple celebration becomes a wild who’s who of past and present, and things quickly spiral out of control.

Peter Fonda plays ‘Heavenly Blues’, the leader of Hell’s Angels chapter from Venice, California while Bruce Dern plays ‘Loser’, his best pal. When they both botch their attempt to retrieve Loser’s stolen bike, Loser ends up in the hospital. When the Angels bust him out, he dies, and they bury him. Nancy Sinatra plays Mike, Blues’ “old lady” and Diane Ladd plays Loser’s wife (Dern’s real-life wife at the time). The plot is basically a buildup to the last half-hour of the film in which Loser’s funeral becomes another wild party.