This episode sees Reese given the social security number of Assistant District Attorney Diane Hanson who is working on a major murder/drugs case. He discovers that a group of corrupt cops are standing in the way of justice and he forcibly persuades one of them to provide some telling information.
When two Wall Street brokers are killed during drug deals, Linda bars Danny from questioning a wounded accomplice until after the man has had surgery.
When the Machine identifies Detective Carter as the next person of interest, Reese, Finch, and Fusco must protect her without giving away their true identities.