Reese and Finch are put in a tough position when the Person of Interest turns out to be Carter. As they evaluate the current threats against her: an abusive husband whom Carter is watching closely; Elias, who is working with a corrupt element in the police department to get rid of her as soon as possible; and the perpetrator of her current murder case, who is threatened by how close Carter is getting to putting him away. Reese enlists Fusco's help to keep an eye on Carter, but both Finch and Reese worry that in order to save Carter, they risk being caught by her. As Reese manages to eliminate one threat after another, the hit comes from a very unexpected place. Carter gets shot, but a vest protects her and Reese eliminates the threat, giving Carter a new understanding of Reese.