This unrelenting historical film probes a 1994 cold case called the Loughinisland massacre, which remains an open wound in the Irish peace process, will keep you on the edge of your seat. The families of the victims—who were murdered while watching the World Cup in their local pub—were promised justice, but 20 years later they still didn’t know who killed their loved ones. Alex Gibney flexes his investigative prowess as he painstakingly uncovers a web of secrecy, lies, and corruption.