In the epic and unmissable final season, Sergeant Catherine Cawood discovers the remains of a gangland murder victim, sparking a chain of events that unwittingly leads her straight back to murderer and rapist Tommy Lee Royce, Catherine's grandson Ryan is now sixteen and has ideas of his own about what kind of relationship he wants to have with Tommy, the man Catherine still refuses to acknowledge as his father. Still battling the seemingly never-ending problem of drugs in the valley and those who supply them, Catherine is on the cusp of retirement. Will she solve this final case?