Carol Martin is found dead in a canal in what appears to be a straightforward case of suicide. When she was found however, Carol was wearing a silver necklace stolen during a recent robbery in Harrow; she was also the girlfriend of local ‘jewellery fence’ Jim Danvers. Superintendent Harcourt (Eddie Byrne), is close to retiring from the police force, but when he discovers that Danvers may be involved in Carol’s death, and the robbery, he sees one last chance at putting his arch nemesis behind bars. But in doing so will Harcourt put himself and his family in danger from Danvers ruthless criminal gang?