On 13 March 1996 Thomas Hamilton walked into the gym hall of a primary school in Dunblane armed with four legally owned handguns and in less than four minutes fired 105 bullets, killing 16 young children, their teacher and injuring many more. It was a crime that first shocked the world then changed the nation.

Based on original archival research and exclusive interviews with parents, politicians and police, One Morning in March tells for the first time the incredible and powerful true story of how, in their darkest hour, a band of parents used their grief as fuel in a fight to forever ban handguns in Britain, and create the tightest gun laws in the world.