In the fifth programme in the highly regarded series, RTE political correspondent David McCullagh examines newly-released official documents and pieces together the secret picture of 1978 through Government eyes.
It includes interviews with key participants and archive footage with original material from state archives in Dublin, London and Belfast.
The year began with a major row between Ireland and Britain over remarks by Jack Lynch on an RTÉ radio programme.
It was also the year of huge protests at plans to build offices on the site of the ancient Viking settlement at Wood Quay and more protests over plans to build a nuclear power station at Carnsore.
The Irish pound was born in a historic break with the UK pound sterling and the H Block protests began to worry politicians in Dublin and London.