Enredo

The Machine identifies a school teacher who witnessed a mob hit as their next POI and Reese and Finch rush to save his life.

Carter, her team (including Fusco) and the organized crime unit are investigating what they know is an execution murder of a mob leader named Benny D'Agostino in a bodega in the Russian mob ruled area of Brighton Beach. The murder was the retaliation hit by the Russian mob on a rival mob infiltrating Brighton Beach, that rival mob led by an unknown man named Elias. D'Agostino was one of Elias' underlings. On the surveillance recording, Carter notices that there was a witness in the bodega who vanished after the shooting. Reese, who gets a call from Fusco about Reese possibly helping to identify and find this missing witness, is one step ahead of Fusco in that he knows that his and Finch's latest case is that witness, a dedicated local schoolteacher named Charlie Burton. As Reese approaches Burton, he knows that the Russian mob are after Burton for being a witness. Reese convinces Burton to go on the run with him to try and get out of the neighborhood. While the Russian mob are in their pursuit, Reese and Burton, who lose contact with Finch, are on their own as they try to get out of the neighborhood to safety in Fusco's custody. As Reese and Burton hole up in no man's land - a building run by the Bulgarian mob - in their effort to find a safe route out, Finch learns that there are people working inside the police assisting one of the mob units. Finch and Reese ultimately discover to where that police infiltration leads, but at that time it may be too late.—Huggo

When the Russian mob leader Benny D'Agostino is executed in a convenience store at Brighton Beach, Carter, Fusco and other police officers investigate the crime scene. Detective Bill Szymanski explains the war between the Russian Mobsters and the Italian Mafia led by the mysterious Elias and the hit was a retaliation and shows the surveillance tape to Carter and Fusco. Carter notes that there a witness, an ordinary bald man, who fled after the killing. Meanwhile, Reese is investigating the schoolteacher Charlie Burton, whose number was provided to Finch by the machine. When Det. Fusco calls Reese asking him to find the witness, Reese tells Fusco that he is watching Burton. He sees the Russian mobsters arriving at Burton's building, but Reese protects and flees with him. Burton is wounded and Reese escapes with him to a building controlled by the Bulgarian mob to escape from the Russians. But their leader contacts the Bulgarian leader and make an arrangement to hunt down Reese and Burton. Meanwhile, Reese's cellular breaks and he is not able to contact Finch, who discovers a rogue police officer from the mob.—Claudio Carvalho, Rio de Janeiro, Brazil

An overheard phone call of a man with an accent talking about wanting to "kill him myself" as we see a person shot in a convenience store.

Carter and Fusco are at the scene and are told by a detective from organized crime that the man killed was a mobster, likely killed by the Russian mafia as retaliation for other hits. Someone named Elias is involved. They see a man bend down near the dead man before leaving the scene. The storeowner is Russian and they feel like the mafia has probably been tipped off that a witness is at large.

Cut to Reese watching a high school teacher named Burton through his apartment window. Fusco calls Reese looking for help finding his witness and describes Burton perfectly. Just then two vehicles full of heavily armed Russian mobsters pulls up and Reese realizes that he is Burton's only hope. He sneaks in the back and gets Burton out of the building just in time. Reese disarms one of the Russians and in the process breaks his cell phone, losing contact with Finch. They attempt to steal a car and two more of the Russians open fire. Burton is wounded in the process and the decided their only escape option is to go through a dangerous high-rise controlled by a vicious Bulgarian drug dealer.

Burton tells Reese that he stopped at the store on his way home. He hid when he saw masked men with a gun, but saw one lift his mask. The guy who was killed told Buron he had a message for Elias that Vinny was going to finish the job for him. Burton tells Reese that he can't testify because he'll never be able to come back to his home.

The dead mobster D'Agostino's widow drops by the station. She tells them it doesn't matter if they find who killed her husband, since Elias will. She's never met Elias, but tells the cops his plan is to reunite the five families and get rid of the Russians.

Carter and Fusco go to Burton's place and hear that he was with a "tall guy in a suit." A passerby took video of a Russian mobster named Peter Yegorov, who is boss Ivan's son.

Finch gains access to the ATM camera that was across the street and sees that Reese got away. He sees an SUV pull up after they leave and an NYPD cop get inside. Finch calls Fusco and gives him the license plate number of the SUV to run.

Peter tells a subordinate they can't go into the Bulgarian-controlled building, but they will guard every exit and get Reese and Burton if they leave.

Burton talks about his relationship with the kids, many of whom are children of Russian mobsters. Reese leaves to "find us a pharmacy."

Finch finds Fusco who tells him the plate is licensed to a shell corporation. Finch thinks that Elias probably wants Burton dead as well, based on what D'Agostino told him before he died.

Reese drops in on a pair of tweakers. He takes a gun from one and helps himself to some supplies.

The organized crime guy tells Carter he's not sure why Elias is making a move for the Russian's turf. Carter tells him about Marlene Elias having an illegitimate son with the don.

Reese used cocaine and glue to help close Burton's wound. He thanks Reese for saving his life. Reese gives him the gun for protection.

The Bulgarians give Peter and his men permission to help them take care of Reese and Burton.

Reese finds a landline in the project and calls Finch. He asks him to find them a way out. Finch tells them about a service entrance they can try and Reese tells him to have Fusco meet them first thing the following morning.

They run into one of Burton's students, Will, in the hall and he lets them hide out in his apartment.

Finch pretends to be Fusco and has the police turn on the GPS and microphone in the SUV from earlier. He hears the man he earlier saw wearing the NYPD uniform talking about needing to "get to them first" before the Russians. Finch wonders if this is Elias.

The Russian finally make their way to Will's apartment. Will is able to convince them he's alone. Burton doesn't seem to be doing very well. Will suggests another way for them to exit.

Reese manages to grab one of the Russians.

Carter goes to see Ivan, who doesn't give them any real information about Peter. He does tell them that Elias is the one who started the war.

Reese, Burton and their hostage leave the project and head for the river. Finch hears that Elias somehow has inside information as to Reese's movements.

Finch calls Fusco and accuses him of being responsible for tipping off Elias. Fusco seems legitimately confused and during the conversation is knocked out from behind by one of Elias' men. He is now waiting at the pier for Reese and Burton.

Carter brings Peter in for questioning. Witnesses told them about shooting up the street. Carter thinks he's trying to kill the guy who saw his father's face. Peter smiles at Carter and tells her she doesn't understand what is happening.

At this very moment the witness starts talking to Reese about his "boss." From behind Burton pulls a gun on Reese -- it seems our teacher is actually Elias himself. Elias tells the Russian that their territory now belongs to him. He shoots the man in the knee and tells him if his boss leaves town he'll let him live. Elias tells Reese he thought killing him would be "ungrateful." He says if Reese stays out of his way, he'll stay out of his.

They dock and the man Finch thought was Elias meets Burton/Elias and opens the door for him.

Reese tells Finch they made a huge mistake letting Elias go, he's upset they saved a killer's life. Finch says they must move on.

We see Ivan killed by Elias' lieutenant. The crooked cop tells Elias "Boss, it's done." Elias responds that "it's only just beginning."