In the dark underbelly of rural Ireland, ex-boxer Douglas "Arm" Armstrong (Cosmo Jarvis, Hunter Killer) has become a feared enforcer for the drug-dealing Devers family. When his ruthless employers order him to kill for the first time, his loyalties are tested in this powerful thriller costarring Barry Keoghan (Dunkirk) and Ned Dennehy ("Peaky Blinders").