The Machine delivers the numbers of the black siblings Tracy, who is eight years old, and his teenage brother Malcolm Booker. Their father is dead and their mother is in jail for possession of illegal weapon, and they are in separated foster homes. Reese notes that they did not go to school and remakes their steps. He stumbles upon a crime scene where he meets the narcotic Detective Erica Lennox. She tells him that it was a war between the Brotherhood and the Armenian mobsters, and they are all dead. They find a large quantity of heroine, but no money. Meanwhile, Finch finds them buying expensive clothes for his sister and him. They conclude that the children are in danger since they have stolen the money and both the Brotherhood and the Armenians are hunting them down. Det. Lennox team-up with Reese and discloses that there is a mole in the Narcotics Department while Shaw finds a way to protect Reese.
"Brotherhood" is another great episode of "Person of Interest", with an excellent story with many twists. The plot is engaging, and the viewer learns who the mole is in the middle of the show. But the identity of Domenic in the end of the show is a great surprise. My vote is nine.
Title (Brazil): "Brotherhood"