An MI5 officer's attempts to foil a possible terrorist plot are undermined by bureaucracy and moral dilemmas. Will he make the world a safer place or be complicit in making a tense situation even worse?

The Thompson family is accused of murder when a stranger dies at their dinner table. Six months later, family friend Tim visits freelance therapist Dr. Eric Sacks and the story finds it's way to the press. The facts are bent and the details spun as the Thompsons become known to the public as 'The Family of Killers'.