On January 30th 1972 the British Army shot thirteen unarmed civilians on a civil rights march in Derry, Northern Ireland. Confidence in British justice evaporated among the victims’ families when Lord Widgery exonerated the soldiers and blighted the reputation of those killed and wounded. Filmmaker Margo Harkin follows the families’ long search for the truth at the new Tribunal of Inquiry into "Bloody Sunday," which was held in Derry and London over a six-year period.  The result is a compassionate and heartfelt film, charged with moral outrage and pointed political commentary.