1936. The Spanish Civil War broke out and the Anarchist militia occupy the Lower Aragon. A Matarranya, Ramon and his wife Dora hide a secret ancestral to all other villagers. Near the farmhouse where they live, twice a year become visible some mysterious lights that come from the surrounding forest. According to family tradition, the lights illuminate a door leading into another world, where no one can bring back. What is truth in the legend when they find out an anarchist in love with Dora seeks a solution with Ramon and disappears through the light.