The series revolves around a computer program for the federal government known as "The Machine" that is capable of collating all sources of information to predict terrorist acts and to identify people planning them.
A team, consisting of John Reese, Harold Finch and Sameen Shaw follow "irrelevant" crimes: lesser level of priority for the government.
According to Nielsen Media Research, the episode was seen by an estimated 9.72 million household viewers and gained a 1.5/5 ratings share among adults aged 18–49.
Failing to get any vital information, Reese (Jim Caviezel) investigates a gang shootout in a building after a drug deal gone wrong.
Drug Enforcement Administration Agent Erica Lennox (Rosie Benton) informs him that the deal was between The Brotherhood and an Armenian gang but the money is missing although they have a survivor only known as Mini (Winston Duke).
Finch (Michael Emerson) finds Malcolm and Tracie using the drug money but they realize they are being followed and use the crowd as a distraction to escape.
In its original American broadcast, "Brotherhood" was seen by an estimated 9.72 million household viewers and gained a 1.5/5 ratings share among adults aged 18–49, according to Nielsen Media Research.
Matt Fowler of IGN gave the episode a "great" 8.5 out of 10 rating and wrote in his verdict, "'Brotherhood' may have felt weird in a few parts (knowing Lennox was the mole for a while, wondering why so much time was spent with Mini), but I usually can count on this show to bring everything together in a cool way by the end.
Like the series' best episodes, this one explores its favorite themes, such as corruption, trust, purpose, and the complex relationship between good and evil.
"[5] Sean McKenna of TV Fanatic gave the episode a 3.5 star rating out of 5 and wrote "Overall, this was just an OK hour of Person of Interest.