The Machine comes up with the social security number of a 14-year-old boy called Darren. As Finch sets about repairing the damage caused by the mysterious hacker ‘Root’, Reese goes to visit Darren, only to find his apartment crawling with police. They are investigating the murder of Darren’s brother Travis, shot a week ago by members of a gang.
Reese hooks up with Detective Carter, who tells him that Travis stood up for a waitress who was being abused by the gang. It seems that they came back to exact their revenge. Darren was taken into care, but has subsequently absconded. Reese presumes that Darren must be their next target as he can identify the killers...
Reese infiltrates a smuggling ring to protect Michael Cahill, an apparently unassuming and upstanding citizen.
When the Machine gives Reese and Finch the number of a down-and-out man, they are forced to turn to former Person of Interest Zoe Morgan for help.
The Machine points Reese and Finch towards a lawyer who specialises in helping some of society’s poorest people and now needs protection of his own.