Brendan Gleeson - who deserves to be crowned High King of Ireland at this stage - stars as the titular Guard. When an international drug-smuggling ring is being investigated by the FBI, Garda Gerry Boyle is partnered with Special Agent Wendell Everett (Don Cheadle) to investigate. The trouble is, Gerry likes prostitutes, drugs and really doesn't seem to care all that much about being a Guard at all, at all.