There is a self-referential flavour in Doubt, A Parable, which will let you return home with a puzzled mind.
Sister James is a young teacher at St. Nicholas Church School, in the Bronx, who, after a meeting with the school's principal Sister Aloysius, is deeply affected by the woman's assertiveness and lack of empathy for her pupils.
Sister Aloysius's unsympathetic attitude extends also to her collaborators and, in particular, towards Father Brendan Flynn's, whose innovative preaching matters and progressive didactic approaches encounter her disapproval.
When Sister James mentions to her superior a one-on-one meeting between Father Flynn and the school's only African-American student, Donald Muller, Sister Aloysius opens a personal investigation on the priest, suspecting him of sexual misconduct. According to Sister James' report, after this private conversation the boy's breath smelled of wine and this fact could either incriminate or exonerate the priest. For Sister Aloysius, in fact, this is the ultimate proof that Father Flynn corrupted the boy, whereas the priest insists that he called a private meeting with Muller after discovering he had drunk some altar wine.