 Ex-cop Eddie Vine summons Boyd (Trevor Eve) to prison, where he is serving life for murdering his partner and best friend, Tom Pallisser. Boyd accepts the invitation expecting a confession. Instead he gets forgiveness and learns that Vine is terminally ill. Boyd is tormented by the possibility that he got it wrong, and sets out to prove to himself once and for all that the right man is behind bars. Boyd is suspended following a hit and run offence whilst under the influence - only he can t remember anything. The remaining team members must find out who framed Boyd and whether Eddie Vine is innocent. Their investigations are interrupted when the Commissioner gives them a new team member to help in Boyd s absence - but the team are convinced she s a plant designed to find incriminating evidence against Boyd.