Two Irish American fraternal twin brothers, Connor and Murphy MacManus, attend a Catholic Mass, where the priest mentions the fate of Kitty Genovese. Later, when Connor and Murphy are celebrating St. Patrick's Day with friends, three Russian mobsters arrive and announce they want to close the pub and take over the land it is built on. A brawl ensues and the next morning, when two of the Russians seek revenge on Connor and Murphy, the mobsters are killed in an act of self-defense.
FBI Agent Paul Smecker is assigned to the case, and finds that the police and local news reporters see the MacManus brothers as heroes. The duo turn themselves in at a police station, where Smecker interviews them. After they retell their incident to Smecker, he declines to press charges and allows them to spend the night in a holding cell to avoid attention from the media. That night, they receive what appears to be a "calling" from God telling them to hunt down wicked men so that the innocent will flourish.