I'll kill yours, if you kill mine.

Maddie's life has come crashing down around her. Her husband has left her and moved on with a new woman and baby. No longer can she run from the past that's been haunting her. The past has destroyed her future.

In a new flat, trying to start a new life, Maddie meets Jade and her young son, Ben. All too swiftly Maddie finds the dark thoughts whirring through her brain. But Jade's different, she loves Ben, doesn't she?

As the two women begin to open up about their exes over a few glasses of wine, Jade conjures a plan, a pact. She'll kill Maddie's if Maddie kills hers. Laughing it off, Maddie returns to her normal life.

But what if it wasn't a joke at all...