Naomi started grief counselling prepared to run for cover as soon as her therapist, Mia, pulled out a crystal or tried to align her chakras.

When Mia suggests that she join a support group, Naomi is sceptical: how could she begin to describe what it felt like to lose her sister, Jo? How could she possibly share her loss and rage to a room full of people? How could she express her helplessness that Jo's killer walks free on a suspended sentence?

And how could she share her deepest desire to see Jo's killer dead by her hand?

In the group sessions, Naomi finds that her experiences and her anger are shared between the other members: Gabrielle, Brooke, Katy, Olivia and Amy. Under the enigmatic leadership of Mia, a plan begins to take shape.

I'll kill yours if you kill mine ...