The Ulas family lives in a remote village in southeastern Turkey, and five of the siblings walk on all fours, palms and feet on the ground, rather than upright. Turkish scientist Üner Tan diagnoses the condition as a genetic mutation affecting balance and coordination, and argues it represents "backwards evolution", a living glimpse of how early hominins might have moved before walking on two legs. Presenter Nicholas Humphrey travels to the village to test that claim against the family's own account of their lives, watching them cook, climb stairs, and move around their home using hands and feet together. Geneticists and evolutionary biologists weigh in on whether the mutation really reaches back millions of years or simply disrupts normal development, and the film does not let Tan's theory go unchallenged. Villagers' reactions range from curiosity to outright stigma, some treating the family as cursed. Directed by Jemima Harrison, the film sits between a medical case study and a dispute over what the family's condition can and cannot tell us about human origins.