When filmmaker Laura Poitras received a series of emails from a figure using the handle "Citizenfour", she initially dismissed them as inconsequential. Thankfully, she had a change of heart and flew out to Hong Kong to meet the NSA source, who turned out to be Edward Snowden. The rest is history, as thrillingly recounted in Poitras' film. Citizenfour documents the exchange as it happened in real time, complete with interviews with the man who leaked the NSA's greatest secrets. Latecomers may not be admitted.