He's a barbaric killer, guilty of the most terrible crime He abducted and tortured an innocent seventeen-year-old girl, brutally raped her, then left her to die Yet when James Martin O'Donnell stood trial at Exeter Crown Court he was acquitted Twenty years later a chance DNA test makes it tragically clear that there has been a shocking miscarriage of justice But the law of double jeopardy means that O'Donnell cannot be tried again