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