The final series sees Bea's girlfriend Allie Novak now ruling the roost, and new hard-line general manager Ann Reynolds is shaking things up. The shock return of notorious former inmate Lou Kelly throws the volatile hierarchy out of kilter as old scores are settled.
Notorious criminals Lou Kelly and Reb Keane make an impact with their shock arrival at Wentworth, threatening the stability of the prison, provoking action from now top dog Allie. As Marie languishes in isolation, a new GM is appointed and Vera juggles motherhood.
Facing prosecution for the siege and a life behind bars following the Attorney General's suicide, an embittered Marie makes a desperate, last-ditch attempt to avenge her son.
Young British 'Wikileaker', Judy Bryant, is remanded to Wentworth facing charges of stealing secrets from the Australian government. Is she a hero of the people … or an enemy of the state?
When Ann announces the closure of the Protection Unit, it forces Will and Vera into preservation mode – how do they protect vulnerable prisoners, especially Marie? Greater turmoil looms when the news of Ferguson's survival breaks.
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Judy sabotages an important presentation for Ann and incurs her wrath, but secures confidential information for Ruby. While Ruby goes on the hunt for her sister, Allie is left to contend with a dangerous Lou Kelly, now amassing a crew of supporters.
Rita sacrifices her one hope of exoneration to rescue Ruby. Believing Marie responsible for Ruby's disappearance, Allie takes extreme measures to get Marie to talk. Marie saves Reb from an attack by 'The Critter', bonding them. Moreover, Ferguson returns to Wentworth.
A desperate Judy seeks her father's help, but his callous rejection pushes Judy to commit a vicious act. Meanwhile, still shaken by her attack on Marie, an increasingly volatile Allie struggles to keep her distance from Ferguson, leading to a dangerous confrontation.
With the prison in lockdown tensions reach crisis point. After Reb loses it during a session with Miller, Lou presses Ferguson to commit an act of evil. Events culminate in a riot, where Allie and Ferguson face choices that will change everything.
A new inmate arrives at Wentworth charged with multiple counts of murder. Part of the cult Lou and Reb escaped from, long held secrets threaten to be exposed. With Ferguson's committal only days away, a desperate Vera enlists Allie's help, with devastating consequences.
Lou discovers her phone is missing and all the money for Reb's transition surgery has been stolen. Boomer finally meets Gavin, but he's not what she expected. With Ferguson's committal looming, Vera makes a last-ditch attempt to expose her.
Allie returns to Wentworth after her near fatal shivving. Boomer and Ruby rally support, with Boomer stepping up as Top Dog. Believing Lou is responsible, Marie manipulates Sheila's hatred of Lou. Ferguson finds it increasingly hard to control her desire for revenge.
Lou, struggling with newfound anger, finds an unlikely source of comfort in Marie. Ferguson reaches out to Vera with a prison tip-off in a recent crime. Meanwhile, Boomer agrees to film salacious prison videos for Gavin in exchange for a spoof donation.
With Lou in the slot, Boomer mounts a vote for Top Dog; but when Lou returns, she invokes her right to challenge Boomer to a shiv fight. As Boomer frets over the showdown, Rita and Ann return to Wentworth. Judy convinces Allie to help her have her hearing adjourned.
Allie secretly plans her revenge against Lou. New prisoner Eve Wilder arrives, setting the stage for some fun and games. Rita's fight for exoneration hits a hurdle when police accuse her and Ruby of Morelli's murder. Ann takes her persecution of Judy to the next level.
Determined to flush out the traitor in their midst, Allie plays a deadly game of cat and mouse. Judy presents Lou with an audacious offer. Ferguson continues to fuel Eve's obsession with Jake, unaware that Vera has finally uncovered evidence of Ferguson’s memory return.
Lou and Judy put their plan into action. Lou then hijacks the plan, using Judy to exact the ultimate revenge. Ferguson continues to manipulate Eve but when Eve is humiliated, she turns the tables. Ann's determination to find the Slammer Cam turns up the heat on Boomer.
Determined to expose and sack Miller, Vera and Will bring Allie in on a plan to professionally compromise him - but Allie's role tips her over the edge. When Miller alerts Ferguson to the fact that Will and Vera are onto them, Ferguson is forced to play her final card.
Rita and the H1 family are in Lou's crosshairs for protecting Marie. Desperate to uncover Lou's plan, Rita turns up the heat on Judy, seeing her as the weak link. Meanwhile, Vera's battle with Ferguson pushes her to the edge of a moral abyss.
With Rita's return imminent, Lou pressures the H1 family to declare allegiance to her. Rita enacts a plan to force information from Lou, only for it to backfire... the family are now targeted by the entire prison. Vera wrestles with the dilemma of exposing Ferguson.
The H1 family is under siege. Will grapples with the threat from Ferguson and protecting the women. Rita is determined to stop Lou's plan. Vera ultimately confronts Ann's duplicity with dire consequences. And Ferguson surprises everyone.