Immersion in a zone where fluid forms and the absence of words reveal that silence is before all things.

Follows the story of Opinião, a theatre group created in 1964 during the early Brazilian dictatorship period to oppose the government through artistic performances. Considered the first left-wing response to the dictatorship, the group gathered now famous Brazilian artists such as Nara Leão, Maria Bethânia, João do Vale and Millôr Fernandes.

Threshold narrates a story of love and mystery which takes place in an old house inhabited by the young Maria, whose fame as a saint extends well beyond the mountains of the interior of Brazil. The arrival of two new characters has a disturbing affect on Maria: a traveler, for whom "Holy Maria" develops an intense passion, and Aunt Emiliana, an elderly lady determined to prepare for the great miracle.