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 Senan Jennings as Aidan Lucey Youssef Quinn as DG Luke Gannon Natalie Radmall-Quirke as Serena Reid 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 Clara Fitzgerald as Róisín Hurley Brian Doherty as Ed Donoghue Siobhán O'Kelly as Elizabeth Lucey Gwynne McElveen as Dr. Myreen Burgess Peter Newington as Man in Bar Alicia Gerrard as Woman in Bar