Frankie (Halle Berry) is a go-go dancer in 1970s Los Angeles, who's raking it in at a nightclub in the Watts district and enjoying a fairly wild lifestyle, but increasing blackouts and psychotic episodes lead to her getting committed to a mental institution. There she finds herself under the care of Oz (Stellan Skarsgard), a concerned psychotherapist who soon discovers that Frankie suffers from multiple personality disorder.