In 2010, Harold was working with Dillinger , an ex-Blackwater mercenary who performed the same duties currently performed by Reese. Their current number is Daniel Casey , a hacker who tests computer security systems.

When the number of Sandra , a 911 operator, comes up, Harold goes undercover at the 911 call-center. Later, a child is kidnapped and the call is routed specifically to Sandra. She is ordered to delete an earlier day’s 911 call logs, in return for the child’s life.

Person of Interest S03E14, The team’s next case is that of Kelli Lin , a former silver medal-winning Olympic gymnast who is later revealed to be an antiquities thief long pursued by Interpol. Shaw investigates Kelli’s house, learning that her next operation is to steal a Gutenberg Bible that is being shipped out that […]

Control holds Harold, Shaw and Arthur captive. She orders Shaw killed, but Root enters, guns blazing, and frees the trio. Root herself is shot and captured by Control, who tortures her, demanding access to the Machine. Control destroys the hearing in Root’s right ear and threatens to make her completely deaf and blind.

Person of Interest S03E11, Reese leaves the team and heads for Colorado, where his father had lived. The Machine provides a new number to Harold, who at first is reluctant, but eventually accepts it on Root’s insistence. The number belongs to Arthur Claypool , Harold’s close friend during his days at MIT.

Flashbacks illuminate Finch’s dealing with survivor’s guilt, Reese’s time doing wetwork, Shaw’s former life as a technically excellent surgeon but completely indifferent to the people she helped, and Fusco’s recounting of exacting vigilante justice to a crook that slipped through the system .

Reese and Carter are crossing town to deliver Alonzo Quinn to the FBI. Simmons alerts HR and several criminal groups of Reese’s identity, limiting their means of movement. The two fight their way to, and break into, the city morgue.