Guest Stars Lisa Hogg as Emma Riley Barry McGovern as Dr. James Whelan Jade Jordan as Donna Walsh Lloyd Hutchinson as Supt. Shanahan Andrew Bennett as Donal Riley Orla Charlton as Deirdre McGuire Seán T. Ó Meallaigh as Jack Lucey Hannah James-Scott as DG Angela Webster Mae Higgins as Young Fia Rebecca Hanssen as Carrie Hurley Ally Ní Chiaráin as Sandra Riley Brendan Conroy as Fergus Slattery Natalie Radmall-Quirke as Serena Reid Senan Jennings as Aidan Lucey Youssef Quinn as DG Luke Gannon Ingrid Craigie as Marjorie Whelan Frank Blake as Sean McGuire Gerard Meehan as Shane Furlong Dara Devaney as Liam McArdle Megan O'Connell as Lynette Brian Doherty as Ed Donoghue Grace Collender as Chloe Whelan Finlay Boylan as Mark Furlong Michael Power as Larry Walsh Emeli Doyle as Brittany Walsh Isaac Finken as Mikey Walsh