'It's like living in a glass cage,' says 42-year-old Christine Harding , who went totally deaf two years ago. But there's a slender hope on the horizon, if she becomes one of the few people in Britain to benefit from a small device called a cochlea implant. For some people it has brought back at least some sounds into their world of silence. Q.E.D. followed Christine as she learned to come to terms with going deaf and having the implant fitted. Would it work or would she have to cope with disappointment?