Guest Stars Barry McGovern as Dr. James Whelan Lisa Hogg as Emma Riley 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 Mae Higgins as Young Fia Hannah James-Scott as DG Angela Webster Rebecca Hanssen as Carrie Hurley Brendan Conroy as Fergus Slattery Youssef Quinn as DG Luke Gannon Natalie Radmall-Quirke as Serena Reid Frank Blake as Sean McGuire Dara Devaney as Liam McArdle Megan O'Connell as Lynette Brian Doherty as Ed Donoghue Grace Collender as Chloe Whelan Lynn Rafferty as Zara Bailey Claire J. Loy as Breda Gleeson Phil Kelly as Gerard