The film draws inspiration from the tragic Cielo Drive massacre of August 1969, weaving together stark reality with unsettling elements of fiction. Sharon Tate, portrayed by Hilary Duff, is a rising Hollywood actress, nearing the birth of her child, yet her mind is plagued by chilling visions of her own fate. Day by day, her premonitions grow darker and more detailed, foreshadowing the brutal murder that awaits her. As members of the Manson Family cult violently invade her life, her most terrifying nightmares begin to unfold.