‘The Scenario: A man returns home, it is night-time and there is a street lamp outside his house. He put the key into the lock of his front door, it swings open, casting light from outside into the hallway. He tries to flick on the light switch, it doesn’t work. The man looks to his right and notices there is a broken window. He takes a few tentative steps forward, he notices that the telephone is off its hook, beeping. He gasps in surprise. A knife appears. Darkness.’