When Mary James is thrown out of her family home on the notorious Crescents estate, the teenager soon learns how tough life can really be. With her new job at Henshall's factory under threat, she is relieved when Lynne offers her a room in her flat - despite the rumours about Lynne's seedier alternative profession. While Mary sticks to a straighter path, her flatmate walks the streets for extra cash. Then, one night, Lynne brings Ali and Raiz back to the flat, both desperate for alibis for murder. Mary soon finds herself involved in a dangerous game.