Someone is poisoning people on G Wing, and suspicion immediately falls on Tanya Turner, as no one was ill until she arrived. Fearful for her life, Tanya tries to come up with a way to get out of prison and makes a deal with a Yardie gang leader. Fenner returns to G Wing, and is back to his old self again. Natalie forces Phyl and Bev to let her in on their plans, while Tina is convinced she killed Al by stealing the hooch.

After being arrested for murder, Tanya is questioned about poisoning Al, but the case against her looks weak and other inmates are soon pulled in for questioning. When the poison is traced back to the rhubarb, the Costa Cons try to get rid of incriminating evidence - but it appears to be too late. The Julies enjoy a birthday party to remember. Frances and Tanya forge an unlikely alliance when a plan to get to Tanya comes to light