When Mary's mother throws her out, the sassy teenager soon learns how tough life can be Her new friend Lynne is older, more sophisticated She has a taste for cocaine and isn't above walking the streets for extra cash to pay for it Mary sticks to a straighter path, until the night Lynne brings Ali and Raiz back to their flat The women don't know that their sexy new friends are small-time criminals, desperate for alibis for a drug-dealer's murder All too soon, Mary is in more trouble than she can handle