The prison is on tenterhooks as the war between Marie and Rita goes over the edge, after Rita has spent a very long time in isolation, she's out for revenge and so is Marie.

Rita and Kaz form an alliance to bring down Marie, whilst Jake's jealously toward Vera is apparent as she forms a bond with a new colleague. Whilst a new acting deputy is voted in, it's someone we would least expect it to be.

Rita’s identity as a cop is under threat of being exposed to the other inmates, and Kaz embarks on a journey of self-discovery and atonement.

Vera learns the sex of her baby whilst Marie and Kaz try and make amends, with Rita facing an impossible dilemma to keep her identity as a former cop a secret after being told to kill Kaz by the new inmate.

The Prisoners and Staff mourn the loss of their Tog Dog, while the hunt is on for the person who murdered her. Tensions remain very high as the investigation into the death stir up emotions for everyone.

The Prisoners tensions are still extremely high as questions start to be answered about what happened. While Boomer has some long awaited catching up to do.

Ruby fights for her life as Marie continues to manipulate Will. The Prisoners are on edge as things are on the edge of imploding, the officers struggle to maintain the peace.

The officers and prisoners find out what really happened to Ruby, as Marie's fall from grace continues her protector wants her silenced for good. Sean manipulates Linda into keeping quiet, and Liz meets her son for the first time in years.

Liz makes a desperate attempt to see her son, whilst Jake becomes concerned for Linda when she's still being manipulated by Sean. The women turn on Marie, as Marie prepares to make a bold plan to be exonerated for her crimes.

Marie stops at nothing to see that her plan go through, and with a fatal outcome and with nothing more to lose will Marie's plan to escape be successful, who lives and who dies?, and will the prison ever be the same again?