The movie starts at the 1998 bomb attack by the Real IRA at Omagh, Northern Ireland. The attack killed 31 people. Michael Gallagher one of the relatives of the victims starts an examination to bring the people responsible to court.

Gerard McSorley
as Michael Gallagher

Michèle Forbes
as Patsy Gallagher

Brenda Fricker
as Nuala O'Loan

Stuart Graham
as Victor Barker

Peter Ballance
as Mark Breslin

Brendan Coyle
as Detective Sergeant John White

Ian McElhinney
as Stanley McCombe

Stanley Townsend
as Sam Pollock

Fiona Glascott
as Cathy Gallagher

Pauline Hutton
as Sharon Gallagher