Kaz is sent to isolation for everyone else's safety, while a new prisoner arrives and is a blast from Rita's past, as the prison spirals out of control, Will and Linda both struggle in their new positions to get on top of the drugs problem.

The Prisoners and Staff mourn the loss of their Top 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.