Person of Interest is an American science fiction crime drama television series created for CBS by Jonathan Nolan, who serves as an executive producer alongside J.J. Abrams, Bryan Burk, and Greg Plageman. The series stars Jim Caviezel as John Reese, a presumed dead former CIA agent who is approached by a mysterious billionaire named Harold Finch (Michael Emerson) to prevent violent crimes before they happen by using an advanced surveillance system dubbed "The Machine". Their unique brand of vigilante justice attracts the attention of two NYPD officers, Joss Carter (Taraji P. Henson) and Lionel Fusco (Kevin Chapman), whom Reese uses to his advantage as he investigates persons of interest. Reese and Finch are later aided by Samantha "Root" Groves (Amy Acker), a highly intelligent computer hacker and contract killer who the Machine later identifies as its "analog interface" and Sameen Shaw (Sarah Shahi), a former ISA assassin who unknowingly dealt with the "relevant" numbers found by the Machine. Finch, Reese, Fusco, and Shaw embark on one last mission to prevent Samaritan from destroying The Machine and cementing its hold over mankind. As Reese and Shaw race to catch up with Finch, he infiltrates a maximum-security government facility in a desperate mission which could mean the end for not only Samaritan, but for himself and The Machine as well. The team must unravel a conspiracy and stay ahead of the Secret Service when the President of the United States becomes their newest POI. Also, Finch separates himself from the team and considers taking drastic action to combat Samaritan. Finch’s number comes up when a fatal error blows his cover identity and sets off a deadly series of escalating encounters with Samaritan’s operatives. The mysterious criminal mastermind known as “The Voice” returns and traps Reese and Fusco in their own precinct with several armed gang members and the latest POI. Also, Root makes a shocking discovery.