Mr Grunt's a man with a mission. He has to get a Person of Great Importance (or POGI) to someone called Mrs Bayliss by the twenty-fifth. Alive and well. And he can't tell anyone more than that, not even his lovely wife, Mrs Grunt, because there will be people trying to snatch the POGI and so the POGI must be transported in secret. It's an exciting adventure, but what interests Mr Grunt most are the silver coins he's been promised at the end of it.