"The Day the World Went Away" is the 10th episode of the fifth season of the American television drama series Person of Interest. It is the 100th overall episode of the series and is written by Andy Callahan and co-executive producer Melissa Scrivner Love and directed by Frederick E. O. Toye. It aired on CBS in the United States and on CTV in Canada on May 31, 2016.
The series revolves around a computer program for the federal government known as "The Machine" that is capable of collating all sources of information to predict terrorist acts and to identify people planning them. A team follows "irrelevant" crimes: lesser level of priority for the government. However, their security and safety is put in danger following the activation of a new program named Samaritan. In the episode, Finch's cover is blown and the team tries to protect him while the war against Samaritan escalates. The episodes features the deaths of Carl Elias and Samantha "Root" Groves, who appeared in the show since the first season. The episode is named after Nine Inch Nails' song of the same name from the 1999 album The Fragile, the song also features at the end of the episode.
According to Nielsen Media Research, the episode was seen by an estimated 6.66 million household viewers and gained a 1.0/4 ratings share among adults aged 18–49. The episode received universal acclaim from critics, who praised the writing, directing, action, acting, twists and emotional impact. The scene where Finch provides a soliloquy received particular praise, with many deeming it one of the show's greatest moments.
Plot
At a café, Finch (Michael Emerson) talks to the Machine through cameras. He has been thinking about his death and wonders if his friends will also die but receives no answer. A waitress tells him welcome back, which worries Finch that his identity may be exposed and leaves. He returns to the station where he talks with Root (Amy Acker) about his plans to close the Machine and decides to test if the Machine will get its own voice and name.
At his college's office, Finch is visited by Reese (Jim Caviezel) and Root, who tell him he is the Machine's newest number. They escape his office just as hitmen arrive. They move to the safe house with Elias (Enrico Colantoni), Shaw (Sarah Shahi) and Fusco (Kevin Chapman), where Shaw deduces that due to her return, Finch's cover was blown. Root then reveals to Finch that before he shut down the Machine, she gave it a self-defense program that only works if Finch activates it. As hitmen arrive, Elias takes Finch to another safe place while the rest of the team prepares to attack the hitmen.
Elias takes Finch to a high-rise building to avoid detection. There, Finch deduces that the café was where he had his first date with Grace, finding out that Samaritan now tracks their past actions. The rest of the team finds that the hitmen worked for the same company, "Temporary Resolutions" so Reese and Fusco go to the offices to investigate. They are ambushed by hitmen but manage to escape. Back at the high-rise building, hitmen locate Elias and Finch and Elias uses henchmen to evade them and get outside. However, during their runaway, Elias is killed by a shot in the head and Finch is captured.
Finch is brought before Greer (John Nolan), who intends to have him forcefully work on Samaritan. Root and Shaw locate him and start a gunfight with Greer's henchmen. Shaw stays behind to fend them off while Root and Finch escape. After a lengthy car chase, Root and Finch evade the hitmen. However, Jeff Blackwell (Josh Close) shoots from a rooftop to the car, intending to kill Finch but Root stands in the way and is wounded. They are forced to stop at a police roadblock where Finch is arrested while Root is taken to the hospital.
The police has Finch in custody with charges going up to treason. Questioned by an agent, a devastated Finch provides a soliloquy on how he intends to abandon the principles he has long followed and vows to kill Samaritan. As he is taken to his cell, he receives a call from a payphone: it's the Machine, with Root's voice. Fusco has discovered that Root didn't survive her wounds and died. Finch asks the Machine for help and she agrees to do it. The power goes off and all inmates escape. While Reese and Shaw inspect the area, they are informed by Fusco of Root's fate. They realize that Finch's number came up not just because he was a victim, but also because he's a perpetrator against Greer and Samaritan.