For David Banks, an armed protection officer charged with neutralising the growing menace to London’s safety, his role is not as clear-cut as it once was. The certainties which ruled his thinking are no longer black and white. Banks has begun to realise that one man’s terrorist is another man’s freedom fighter. Never have those distinctions been more dangerous to a police officer with his finger on the trigger — and to those who depend upon him. On a bright spring morning the two men’s paths will cross. Before then, their commitment will be shaken by the journeys which take them there. The suicide bomber and the policeman will have equal cause to question the roads they’ve chosen. Win or lose, neither will be the same again.