Years after the shocking Charles Manson murders, the three women who killed for him—Leslie Van Houten, Patricia Krenwinkel, and Susan Atkins—remain under the spell of the infamous cult leader. The still-delusional trio are confined to an isolated cellblock, until an empathetic graduate student (Merritt Wever) is enlisted to rehabilitate them. But are the women ready to confront the horror of what they did? Boundary-pushing auteur Mary Harron presents a provocative new perspective on one of the most notorious crimes of the 20th century.