The Ballymurphy Precedent tells the unknown story of the death of eleven innocent people at the hands of the British Army in a Catholic estate in Belfast in 1971. This is a massacre that few have heard of, yet it was one of the most significant events in the Troubles. The British army continues to cover it up because they cannot afford to admit the truth. The relatives of those who died are fighting for justice - and our investigation shows why. This secret massacre led directly to the Bloody Sunday killings by the same Parachute regiment just five months later.