"What do you do when you're not sure?" Father Flynn asks in the opening line of this drama set in 1964 in a Catholic grade school in the Bronx. His colleague, Sister Aloysius, suspects him of sexual misconduct with the school's first African American student. She faces a gravely drastic decision: openly accuse a higher-up without firm evidence, or bury her suspicions and leave room for doubt. Doubt offers an honest and timely examination of the ambiguous line between gossip and truth, justice and compassion, right and wrong, certainty and doubt.