They called the fence the Peace Line. And they still do. It runs for 13 miles across Belfast, longer than it did during the days of the Troubles, but still dividing the city into different sectarian zones. At one point, it butts into the wall of the semi-detached house in the west of the city where Sr Kathleen Keane used to live, resuming on the other side. Sr Kathleen’s front door opened on to the Catholic side of the divide, her back door on to its Protestant neighbour.

The main transport gate in the Peace Line remained shut but a pedestrian gate was open during daylight hours unless there was trouble – which there frequently was. When that was closed, anyone wanting to walk from the Protestant to the Catholic neighbourhood would have to take a long detour. Unless Sr Kathleen was in.