Pedro Calungsod, a young Filipino man, leaves his Visayan native roots to join the Spanish Jesuit priest Father Diego de San Vitores in his mission to the Marianas Island (Guam) in 1668. Despite the longing for his father and the threats to their lives, even at the peril of death, Pedro and Father Diego continued their missionary work. This is the story of how the young Filipino saint, between wars and persecutions, played his part in this diveine mission.