Guest Stars Lisa Hogg as Emma Riley Barry McGovern as Dr. James Whelan Jade Jordan as Donna Walsh Andrew Bennett as Donal Riley Orla Charlton as Deirdre McGuire Seán T. Ó Meallaigh as Jack Lucey Lloyd Hutchinson as Supt. Shanahan Mae Higgins as Young Fia Hannah James-Scott as DG Angela Webster Rebecca Hanssen as Carrie Hurley Ally Ní Chiaráin as Sandra Riley Brendan Conroy as Fergus Slattery Ingrid Craigie as Marjorie Whelan Natalie Radmall-Quirke as Serena Reid Senan Jennings as Aidan Lucey Youssef Quinn as DG Luke Gannon Gerard Meehan as Shane Furlong Siobhán O'Kelly as Elizabeth Lucey Clara Fitzgerald as Róisín Hurley Finlay Boylan as Mark Furlong