McManus comes across a box with Hill's memoirs of his past 6 years at Oz. Alvarez and Schillinger are transferred out of solitary to gen pop, and once Alvarez returns, McManus has him try to work things out with Guerra. Meanwhile, Rebadow gets some much needed cheering up when he is transferred to the library and meets Stella Coffo, the librarian; Kirk, who claims to be possessed, is transferred to death row; Suzanne Fitzgerald puts together an inmate production of Macbeth; Schibetta returns to Gen Pop; and Oz is placed on lockdown following race riots taking place outside of the prison.
As Beecher is granted parole, Mayor Wilson Loewen arrives at Oz, which, in turn, creates a twist in the feud between Schillinger and Beecher. The mystery behind why inmates in solitary confinement are getting sick is solved by Dr. Nathan.
Devlin scrambles to find a win-win solution to his pardoning issues when Loewen threatens to go to the press. Beecher says his goodbyes to Keller and is later released from Oz. Redding moves to telemarketing, opening up the kitchen, which Glynn gives to Pancamo. Meanwhile, Morales dies due to liver failure; Glynn learns why inmates are dying due to poisoning; Hoyt thinks he saw the devil while dealing with the guilt of killing Kirk; and Said is shot by a reporter.
An investigation into Said's death begins. Beecher uncovers more information about Keller's case, which leads to the overturning of Keller's sentence and he is returned to Unit B. Rebadow's relationship with the librarian becomes more complex when he learns she's sick. Meanwhile, Hoyt's sentence is overturned; new inmate Jahfree Neema arrives at Oz; White returns to Em City after making a deal with Glynn; and Dr. Nathan finds that Martinez was suffocated.
The Muslims put out the first copies of Hill's journal, but soon find that their business venture may not be as good as they had thought. Robson is able to rejoin the Brotherhood. Murphy goes to Glynn, which leads to the suspension of Brass. Busmalis is visited by Norma and the baby and she proposes to him. Meanwhile, Cyril's execution is rapidly approaching and he begins to show the side effects of ETC; Keller goes to Beecher for a favor, and then turns on him by ratting him out.
Omar White sponsors Idzik as he transfers to Em City. Glynn realizes a connection between Johnson and Loftus, which brings up more details surrounding Loewen's death. Robson continues with his rape counseling. The inmates support the O'Reilys as Cyril's execution nears.
New arrival Bukowski and his brownies infringes on the Italian's business. Busmalis and Norma tie the knot. Keller is once again caught in the middle of Schillinger and Beecher. Meanwhile, Seamus O'Reily arrives at Oz; Robson is given some bad news; and the Correctional Officer Association's annual awards banquet ends with a bang -- a surprise death.
Querns makes a return to Oz as a warden. As Howell learns that she's pregnant, Rebadow unsuccessfully petitions to artificially inseminate Norma. Vahue returns to Oz to talk to young prisoners and has a reunion with Brass. Alvarez receives bad news from the parole board. The mystery behind what really happened to Cloutier is revealed by Hoyt to Ray. Meanwhile, Idzik's death penalty sentence is overturned; Dr. Nathan lends her support to Ryan on the day of Cyril's execution; and the production of Macbeth is held, but Schillinger's fate is the same as the character he plays.