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.

A murderer is using his computer expertise to blackmail hospital doctors, and threatens that a patient will die every twenty-four hours unless his demands are met. Commander Blake has her own personal problems - she is being stalked by the sister of a victim of James Lampton and is stabbed in the arm, and her sister is still fighting her battle against cancer.