Finch breaks into the NSA to plan the virus that will destroy Samaritan... and the Machine. The only ones who can get him out alive are Reese, Sameen, and the Machine, if they can get to him in time. Meanwhile, the Machine shows Finch simulations of what the world would have been like without it.moreless
Reese and Finch try to get the case containing the Machine's damaged code to the station so that they can decompress it. Meanwhile, Fusco deals with the aftermath of Dominic and Elias' shootings, while Root tries to dodge Decima's agents without the Machine's help.moreless
Patterson lands in harm's way after uncovering a hidden message in a crossword puzzle. Meanwhile, Oscar reveals more info to Jane about her past; and Weller asks his dad for theories about Taylor Shaw's kidnapping.moreless
The town of Willoughby has been turned into a reeducation facility, and Doyle makes things difficult for Tom.
Cat and Vincent must revisit a romantic destination from their past in order to prevent Sam from obliterating a large group of people and to figure out Sam's true agenda. The destination enables Cat and Vincent to remember how in love they once were.moreless
Miles, Monroe and Rachel head to Mexico to look for Miles' son.
Miles, Rachel and Charlie continue their search for Aaron.
Aaron's experience with death attracts interest. Miles and his compatriots attempt to escape. Rachel and Gene's personal problems impact Charlie. Meanwhile, Neville takes his chances with the Patriots.
After being betrayed, Carrie attempts to get the truth out about Brody's innocence before the CIA can prevent the disclosure. Saul recruits new help for the CIA, and Dana adjusts to living with her family again, and being away from her new boyfriend, Leo.moreless
Joanna discovers a set of shocking videos. Will fires Joanna and julian helps the FBI to get evidence against Audrey. Edward turns himself in and Wyatt is released from prison. Mia helps her biological father.moreless
Charlie, the newest of Carroll's exposed followers, unleashes a new plan. While Ryan tries to turn Emma, Paul, and Jacob against each other, Emma makes a decision that will affect her comrades.
Nolan and Martina take the case of Ed Koneke, whose young daughter became sick from carbon ethylene in the groundwater. A subsequent class action lawsuit against a local chemical plant is going nowhere and Ed can no longer afford the medical bills. But when Ed takes an off-hand remark by Martina literally and punches the chemical company's CEO in the face, he finds himself on trial for assault while Martina is called as a witness for the prosecution.moreless
With Nucky's trial right around the corner, Jimmy tries to make amends, but is it too late? Margaret makes a life changing decision and Van Alden flees to the Midwest.
Jimmy despairs because of his wife's murder which the police suspect him of committing. With Jimmy off the scene, his partners try to take his share.
Nucky heads to New York to hire a new lawyer after firing the last. After failing to get the black workers back to work, Jimmy asks Chalky for his demands and instructs Mickey to pay his debt to Manny.moreless
Jimmy speaks with his father after nine years. Nucky has heated conversations with both Eli and Margaret regarding the business and the murder of Margaret's husband. Van Alden takes matters to the extreme with Agent Sebso and Angela's plans to flee to Paris are scuppered.moreless
Nucky gets troubling news while visiting the Republican National Convention in Chicago.
Nucky's St. Patrick's Day celebrations are cut short when Van Alden raids the establishment.