The myth of St. Barbara is short and somber. The daughter of a rich pagan, Barbara won’t align herself with her family’s values and is sent away, tortured, and subsequently executed by her own father. She becomes a martyr and is recognized as a saint following her death. Nan Goldin, in her new three-panel film, invokes the saint while remembering her own Barbara, her elder sister. The victim of abuse at the hands of both their parents, and also at the psych ward where she was sent at 12, Barbara—who would die by suicide, at 18—is the film’s primary focus. Shown in a former Welsh Chapel, the unconventional space highlights Goldin’s religious analogy, ahead of a Gagosian retrospective that makes its way to New York in the fall. —Zack Hauptman