A close look at the parallel lives of Margaux and Mariel Hemingway, sisters born with a world-famous last name that stood for both genius and self-destruction. But while Margaux followed her grandfather's fate, Mariel confronted the family's dark legacy and reinvented herself as a mental health and wellness advocate. This episode was written and performed by Michael Schulman, a writer at The New Yorker and the author of "Her Again: Becoming Meryl Streep," a New York Times bestseller.