In the thirteenth century, in Ireland, a group of monks must escort a precious relic to Rome. The faith that binds them will soon become the element that will separate them, in front of the numerous hurdles in their path and the many dangers. The leaders of the group of monks are brother Diarmuid and brother Ciaran. According to the legend, in the box that goes to the monk in Rome is a stone that took the life of an Irish saint and still possesses divine authority. The monks want to take her to the Vatican because the priests here use his powers.