This film investigates the 1994 Loughinisland massacre in Northern Ireland, a cold case that remains an open wound in the Irish peace process. 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. No Stone Unturned uncovers a web of secrecy, lies, and corruption that so often results when the powerful insist they are acting for the greater good.