When a small-town Irish cop with a crass personality is partnered with a straight-laced FBI agent to bust an international drug-trafficking ring, they must settle their differences in order to take down a dangerous gang.
| Actor | Role |
|---|---|
 Brendan GleesonSergeant Gerry Boyle | Sergeant Gerry Boyle |
 Don CheadleFBI agent Wendell Everett | FBI agent Wendell Everett |
 Liam CunninghamFrancis Sheehy | Francis Sheehy |
 Mark StrongClive Cornell | Clive Cornell |
 Katarina ČasGabriela McBride | Gabriela McBride |
 David WilmotLiam O'Leary | Liam O'Leary |
 Rory KeenanGarda Aidan McBride | Garda Aidan McBride |
 Laurence KinlanPhotographer | Photographer |
 Dominique McElligottAoife O'Carroll | Aoife O'Carroll |
 Sarah GreeneSinead Mulligan | Sinead Mulligan |
 Fionnula FlanaganEileen Boyle | Eileen Boyle |
 Gary LydonGarda Inspector Gerry Stanton | Garda Inspector Gerry Stanton |
 Mícheál Óg LaneEugene Moloney | Eugene Moloney |
 Mark O'HalloranGarda No. 1 | Garda No. 1 |
 David PearseBartley | Bartley |
| OOwen SharpeBilly Devaney | Billy Devaney |
 Wale OjoDoctor Oleyuwo | Doctor Oleyuwo |
 Darren HealyJimmy Moody | Jimmy Moody |
 Conor MoloneyDetective | Detective |
 Laura HitchingsFemale Garda | Female Garda |
 Pat ShorttColum Hennessey | Colum Hennessey |