John Michael McDonagh Director, Screenwriter Brendan Gleeson James Lavelle Actor Chris O'Dowd Jack Brennan Actor Kelly Reilly Fiona Actor Aidan Gillen Frank Harte Actor Dylan Moran Fitzgerald Actor Marie-Josée Croze Teresa Actor Isaach de Bankolé Simon Actor M. Emmet Walsh Old Man Actor Domhnall Gleeson Freddie Joyce Actor David Wilmot Father Leary Actor Pat Shortt Brendan Lynch Actor Gary Lydon Inspector Stanton Actor Killian Scott Milo Herlihy Actor Orla O'Rourke Veronica Brennan Actor Owen Sharpe Leo Actor David McSavage Bishop Garret Montgomery Actor Chris Clark Producer Flora Fernandez-Marengo Producer James Flynn Producer Robert Walak Executive Producer Ronan Flynn Executive Producer Larry Smith Cinematographer Chris Gill Film Editing Patrick Cassidy Original Music Mark Geraghty Production Design Fiona Daly Art Director Eimer Ni Mhaoldomhnaigh Costume Design Jina Jay Casting