Brendan unearths a mole in the IRA's ranks.

Cast: Lola Petticrew, Hazel Doupe, Anthony Boyle, Josh Finan, Tom Vaughan-Lawlor, Rory Kinnear, Judith Roddy, Amy Molloy, Ryan McParland, Frank Blake, Seamus O'Hara, Martin McCann, Emily Healy, Lennox Loughran, Ava-Rose Gallagher, Matthew Murphy, Conor Trainor, Sarah Gordon