The clinical trial is heating up and it's time for Gaskell to live up to his reputation. Nicky tests Sacha's patience in a bid to prove her abilities. Frieda has to play tough in order to win Jac's trust.

Roxanna has been living at the hospital in her relentless effort to aid Oliver's recovery. The bullet is starting to leak poison into his brain and must be removed. Can she convince him to go under the knife again and risk more damage to his mind and body? Fletch's security measures inadvertently put a bike courier in a Darwin bed. Jac finds a replacement for the lost vinyl from Raf's collection and lectures Fletch on the perils of snooping on Evie's phone messages. Nicky, Meena and a reluctant Frieda compare their respective Valentine's card hauls. Jason's girlfriend Greta turns up on AAU with breathing difficulties. A shocked Serena discovers the truth of her condition and expresses concern over the couple's future. Donna tries to find ways to extend Ric's recovery in order to delay his return to prison.