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With C Wing on lockdown, the prisoners' mental health reaches crisis point in an under-resourced and chaotic system. Meanwhile, Rose sees an opportunity, and Toby threatens to escalate his suspicions.

C Wing is under lockdown, and the prisoners' mental health is worsening. Leigh tasks her team with an emergency mental health first-aid programme for the inmates - but, despite their best efforts to offer support, in an under-resourced and chaotic system, someone is bound to slip through the cracks. But who will it be?

As C Wing's mental health crisis brings Rose into contact with prisoner Lucas Cooper, she sees an opportunity to help both herself and Lucas. Meanwhile, Gary's efforts to counsel a severely ill patient have unexpected consequences for his own state of mind.

With Leigh now utterly disillusioned, she's in no mood to tolerate accusations from Toby, who is armed with evidence against her. In the face of Leigh's evasions, Toby threatens to escalate his suspicions to the Governor. But before he has a chance to do so, a gunshot rings out over C Wing.