Guest Stars Seamus O'Hara as Mackers (Belfast Project) Judith Roddy as Jean McConville Stuart Graham as Albert Price Co Starring Emily Healy as Helen McConville Rylee Neilly Large as Michael McConville Matthew Murphy as Billy McConville Conor Trainor as Jim McConville Lennox Loughran as Tucker McConville Ava-Rose Gallagher as Agnes McConville Isaac Heslip as Archie McConville Frank Blake as Seamus Wright Michael Condron as Deckie Keith McErlean as Seamus McKendry Aoife Conlon as Young Dolours Gerard Jordan as Frank Eoin Lynch as Reporter Dáithí Ó Haragáin as Danny Paul Mallon as Older Michael McConville Frank Laverty as Marty Tony Devlin as Older Jimmy Paddy Towers as Kevin McKee Maisie Squibb as Young Marian Leonard Buckley as Brian Ian McElhinney as Father Reid Kyle Hixon as Older Jim McConville Christopher Dunne as Gravedigger Ryan Hayes as Older Tucker McConville Andrew Steele as Sinn Fein One Maurice Bryne as Coroner Richard McFerran as Detective Peter Collis as Man with Dog Fintan Shevlin as Older Billy McConville Tebby Fisher as White House Aide Marty Breen as Pharmacy Clerk Steve Gunn as Sinn Fein Two Aoife O'Sullivan as Intern Harry Burton as Engineer Ged Forrest as Hardliner Two Natalie Radmall-Quirke as Older Agnes McConville Edmund Dehn as Old Man Danielle Magennis as Older Susie McConville Rory Mullen as Hardliner One Gerard McCabe as Older Archie McConville Killian Donnelly as Radio Host Lorna Lowe as Immigration Officer