The Commander
Clare Blake, a high-ranking, ambitious officer in the Metropolitan Police's Serious Crimes Unit, leads complex murder investigations that often blur the line between her professional and personal lives.

As the investigation continues, suspicion shifts from Jimmy Bannerman to Terry Donnolly when an eyewitness puts him at the scene of the murder and information on his troubled childhood comes to light. Doug has been coping with his own emotional events at home, but realises he may already know who the real killer could be.