Between 1920 and 1954, hundreds of Irish priests, nuns, and lay workers served as Roman Catholic missionaries across Central China, running schools, clinics, orphanages, and disaster relief operations. The film follows their experience through decades of upheaval: catastrophic floods and famine, epidemic disease, the Japanese invasion, and years of civil war between Nationalists and Communists. It draws on archival photographs, letters, and mission records to reconstruct daily life in the missions, then turns to the final chapter, when the victorious Communist Party moved to shut foreign religious institutions down. Missionaries describe interrogation, surveillance, and eventual expulsion as the People's Republic consolidated control, ending a Catholic presence that had lasted more than three decades. The documentary treats the missionaries less as heroes than as witnesses, using their firsthand accounts to trace how a foreign religious institution operated inside, and was ultimately expelled from, one of the twentieth century's most turbulent political transformations. It is a history told through the people who lived inside it rather than through top-down political narrative alone.