Erin Vassilopoulos’ directorial feature debut, Superior, is having its world premiere in the U.S. Dramatic Competition at this year’s Sundance Film Festival. Superior was inspired by a short film of the same name that she wrote and directed in 2015 when she was working on her MFA from New York University’s Tisch School of the Arts. While both films explore the relationship of identical twins and feature the same actresses, they tell very different stories. In the feature length version, when Marian is on the run, she goes to the only place she knows is safe: her childhood home. She is greeted by her estranged sister, Vivian, a stay-at-home housewife struggling to conceive and on the verge of a failing marriage. Though the two are identical twins, they live opposite lives. Marian’s mysterious return disrupts Vivian’s small-town routine, and the sisters must learn to reconnect and reconcile. When Marian's haunting past finally catches up to her, their separate worlds collide, catapulting both sisters into grave danger. I spoke with Vassilopoulos by email during the Festival. Our conversation began with what it was about twins that captured her imagination as a storyteller.