When Robbie McLaughlan, a Flying Squad officer with London's Metropolitan Police, shoots and kills a robber during a bank raid, his private and professional life begin to fall apart. The family of the dead man discovers McLaughlan's identity, and abducts his young son with the intention of luring McLaughlan to his death. But McLaughlan is a man with a secret and, long estranged from his own father, he ultimately has no option but to turn to the man he despises, for only he can possibly help him.