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When Leigh learns of a dangerous rumor about an undercover police officer on C Wing, it threatens to disrupt Rose's first day back since Toby's death. But can the rumor possibly be true? The new Governor warns Leigh to shut it down-otherwise the safety, and even the future of the wing, could be in jeopardy.

After discovering the identity of the undercover police officer, Leigh learns damaging information that causes her to doubt the loyalties of her team. Meanwhile, Rose is left worried for her safety when it turns out that the recent arrival of the terrifying double murderer, Tyler Reeks has links to Louis. Could he be here to kill her? And can she really trust Louis' promises to keep her safe?

Leigh is reeling after the discovery of a corrupt officer on her team. But what will she do about it? Morgan puts pressure on Rose to make a decision, one with potentially life-threatening consequences. An accident in the prison workshop leads the inmates to go on strike and the wing descends into chaos; while Jackie makes a shocking confession to Gary.

Reeks is out to kill Rose today and Morgan takes matters into his own hands, setting him on a collision course with Leigh. Rose agrees to get close to Louis and find out who killed Katy Trent-in return for immunity. But is this the real reason Rose is co-operating with Morgan-and can she carry out her plan before Reeks gets to her, and before Morgan is uncovered by Hemmings as the undercover cop?

Morgan is frustrated at Rose's lack of progress with Louis. She plays on his feelings for her and for his son to persuade him to reveal the identity Katy Trent's killer-but the truth, when it finally comes out, is far more shocking than she could ever have imagined. Meanwhile, the net is closing in on Morgan as his true identity is discovered.

The Prisons Minister finally arrives for a visit and C-Wing's future hangs in the balance. But with Morgan's identity as the undercover police officer now exposed, and his life in imminent danger, can Leigh keep a lid on things? In a thrilling series climax, a deadly hostage situation unfolds and Leigh and Rose must come together to save not only a life but the very future of C Wing and its team.