The ideology of Catholic nationalism inspired and justified State terrorism in Argentina, through the association between the Catholic Church and the military. Leopoldo Nacht, an 84-year-old man, who lived through the persecution and disappearance of his friends in the 1976 dictatorship, investigates unpublished files to prevent fragments of this ideology from being reinstated in the new generations. It is his legacy. Assim, rediscovers throughout the history of the 20th century in Argentina, the main crimes and concepts of the nationalist ultra-right, mainly: anti-communist, anti-democratic and xenophobic.