Watch at FMovies. The film paints a dreamlike day in the life of Didion and California in the late 1960s, when the brilliant young journalist is hurtled from encounters with jailed Manson girls to protesting Black Panthers, and from Nancy Reagan pausing in a photo op to Vietnam War POWs — climaxing with an epilogue in a near-future California where an AI Joan encounters a dystopia beyond her wildest anxiety dreams.