In August 1879, the tiny Irish village of Knock witnessed a spectacular apparition. Through pelting rain, luminous images of the Virgin Mary, Saint Joseph and John the Evangelist shone like a beacon. For an Irish people enduring a season of suffering and despair, this was a much-needed sign of hope, promising mercy, the Blessed Sacrament and the powerful intercession of the saints. Revisit the events at Knock with leading experts providing theological context on what they mean for Catholics today.