Polly, just released from prison, vows to start a new life. At first things look pretty promising: She finds a job and meets Stefan, a policeman. But then her family interferes. Shifty Ronny, her sister’s new bloke, proposes a mad business idea to her parents. A dead cert, he says, aluminium prefabs. All they need is a little money to start up. But that small problem, Ronny promises, can soon be solved, as well: A raid on a drinks shop will provide all the cash they need …