Plot summary
In flashbacks, Detective Carter, while serving in the Army, convinces an Iraqi deliveryman to give intelligence on Al-Qaida. Carter is outraged when the American soldiers kill the man during the operation, causing one to warn Carter that she's on her own. In the present, Carter's investigation into the Elias case has earned her a place on Elias' hit list, making her the next POI. Reese faces the challenge of protecting her without revealing his identity. While Carter investigates the murder of a teenager during a drive-by shooting by an arms dealer, Reese continues following Carter, who meets with one of her confidential informants – whom Elias has turned against her.
The informant reluctantly shoots Carter twice in the chest, but she is protected by a bulletproof vest; Reese kills the informant before he can finish the job. Reese parts ways with Carter accepting that she will still have to arrest him given the next chance, but promising that she is not alone. Reese threatens an HR higher-up in order to force him to get the hit called off.
Credits
Adapted from Wikipedia contributors, Person of Interest season 1. HTML formatting and reference markers removed.