'The Curse' is one of the commonest names for menstruation, something that happens to women once a month for at least 30 years of their lives. How has a natural process acquired such a name? From the earliest times of the Christian church, women were held to be 'the devil's gateway', the route through which evil comes into the world; still today in many countries, the taboo survives that excludes menstruating women from the practice of their religion. This Everyman film explores the tangle of ideas that conspires to make women feel their monthly period is something shameful, to be kept hidden.